diff --git a/lldb/include/lldb/Host/Host.h b/lldb/include/lldb/Host/Host.h
index 884c5cf632134a..269bb18571b0fe 100644
--- a/lldb/include/lldb/Host/Host.h
+++ b/lldb/include/lldb/Host/Host.h
@@ -27,8 +27,8 @@ namespace lldb_private {
 class FileAction;
 class ProcessLaunchInfo;
 class ProcessInstanceInfo;
-class ProcessInstanceInfoList;
 class ProcessInstanceInfoMatch;
+typedef std::vector<ProcessInstanceInfo> ProcessInstanceInfoList;
 
 // Exit Type for inferior processes
 struct WaitStatus {
diff --git a/lldb/include/lldb/Target/Platform.h b/lldb/include/lldb/Target/Platform.h
index 7c2746ddec687c..06290b34ac0e0b 100644
--- a/lldb/include/lldb/Target/Platform.h
+++ b/lldb/include/lldb/Target/Platform.h
@@ -33,8 +33,8 @@
 namespace lldb_private {
 
 class ProcessInstanceInfo;
-class ProcessInstanceInfoList;
 class ProcessInstanceInfoMatch;
+typedef std::vector<ProcessInstanceInfo> ProcessInstanceInfoList;
 
 class ModuleCache;
 enum MmapFlags { eMmapFlagsPrivate = 1, eMmapFlagsAnon = 2 };
diff --git a/lldb/include/lldb/Utility/ProcessInfo.h b/lldb/include/lldb/Utility/ProcessInfo.h
index c00b41c3ffd5f2..d2ad40487224ba 100644
--- a/lldb/include/lldb/Utility/ProcessInfo.h
+++ b/lldb/include/lldb/Utility/ProcessInfo.h
@@ -155,41 +155,7 @@ class ProcessInstanceInfo : public ProcessInfo {
   lldb::pid_t m_parent_pid;
 };
 
-class ProcessInstanceInfoList {
-public:
-  ProcessInstanceInfoList() = default;
-
-  void Clear() { m_infos.clear(); }
-
-  size_t GetSize() { return m_infos.size(); }
-
-  void Append(const ProcessInstanceInfo &info) { m_infos.push_back(info); }
-
-  llvm::StringRef GetProcessNameAtIndex(size_t idx) {
-    return ((idx < m_infos.size()) ? m_infos[idx].GetNameAsStringRef() : "");
-  }
-
-  lldb::pid_t GetProcessIDAtIndex(size_t idx) {
-    return ((idx < m_infos.size()) ? m_infos[idx].GetProcessID() : 0);
-  }
-
-  bool GetInfoAtIndex(size_t idx, ProcessInstanceInfo &info) {
-    if (idx < m_infos.size()) {
-      info = m_infos[idx];
-      return true;
-    }
-    return false;
-  }
-
-  // You must ensure "idx" is valid before calling this function
-  const ProcessInstanceInfo &GetProcessInfoAtIndex(size_t idx) const {
-    assert(idx < m_infos.size());
-    return m_infos[idx];
-  }
-
-protected:
-  std::vector<ProcessInstanceInfo> m_infos;
-};
+typedef std::vector<ProcessInstanceInfo> ProcessInstanceInfoList;
 
 // ProcessInstanceInfoMatch
 //
diff --git a/lldb/include/lldb/lldb-forward.h b/lldb/include/lldb/lldb-forward.h
index faca8fac62ef0e..6b22e50a553d41 100644
--- a/lldb/include/lldb/lldb-forward.h
+++ b/lldb/include/lldb/lldb-forward.h
@@ -156,7 +156,6 @@ class Process;
 class ProcessAttachInfo;
 class ProcessInfo;
 class ProcessInstanceInfo;
-class ProcessInstanceInfoList;
 class ProcessInstanceInfoMatch;
 class ProcessLaunchInfo;
 class ProcessModID;
diff --git a/lldb/source/Commands/CommandObjectPlatform.cpp b/lldb/source/Commands/CommandObjectPlatform.cpp
index e473756f1e9362..5a6573307c611c 100644
--- a/lldb/source/Commands/CommandObjectPlatform.cpp
+++ b/lldb/source/Commands/CommandObjectPlatform.cpp
@@ -1128,7 +1128,7 @@ class CommandObjectPlatformProcessList : public CommandObjectParsed {
               ProcessInstanceInfo::DumpTableHeader(ostrm, m_options.show_args,
                                                    m_options.verbose);
               for (uint32_t i = 0; i < matches; ++i) {
-                proc_infos.GetProcessInfoAtIndex(i).DumpAsTableRow(
+                proc_infos[i].DumpAsTableRow(
                     ostrm, platform_sp->GetUserIDResolver(),
                     m_options.show_args, m_options.verbose);
               }
@@ -1462,12 +1462,12 @@ class CommandObjectPlatformProcessAttach : public CommandObjectParsed {
         match_info.SetNameMatchType(NameMatch::StartsWith);
       }
       platform_sp->FindProcesses(match_info, process_infos);
-      const uint32_t num_matches = process_infos.GetSize();
+      const uint32_t num_matches = process_infos.size();
       if (num_matches == 0)
         return;
 
       for (uint32_t i = 0; i < num_matches; ++i) {
-        request.AddCompletion(process_infos.GetProcessNameAtIndex(i));
+        request.AddCompletion(process_infos[i].GetNameAsStringRef());
       }
       return;
     }
diff --git a/lldb/source/Commands/CommandObjectProcess.cpp b/lldb/source/Commands/CommandObjectProcess.cpp
index 20bbf95dca82ac..043765a0c09cf8 100644
--- a/lldb/source/Commands/CommandObjectProcess.cpp
+++ b/lldb/source/Commands/CommandObjectProcess.cpp
@@ -348,11 +348,11 @@ class CommandObjectProcessAttach : public CommandObjectProcessLaunchOrAttach {
         match_info.SetNameMatchType(NameMatch::StartsWith);
       }
       platform_sp->FindProcesses(match_info, process_infos);
-      const size_t num_matches = process_infos.GetSize();
+      const size_t num_matches = process_infos.size();
       if (num_matches == 0)
         return;
       for (size_t i = 0; i < num_matches; ++i) {
-        request.AddCompletion(process_infos.GetProcessNameAtIndex(i));
+        request.AddCompletion(process_infos[i].GetNameAsStringRef());
       }
     }
 
diff --git a/lldb/source/Host/freebsd/Host.cpp b/lldb/source/Host/freebsd/Host.cpp
index 21fdeaea0898d9..1e8981b00e5389 100644
--- a/lldb/source/Host/freebsd/Host.cpp
+++ b/lldb/source/Host/freebsd/Host.cpp
@@ -195,10 +195,10 @@ uint32_t Host::FindProcesses(const ProcessInstanceInfoMatch &match_info,
     bool already_registered = false;
     for (uint32_t pi = 0;
          !already_registered && (const int)kinfo.ki_numthreads > 1 &&
-         pi < (const uint32_t)process_infos.GetSize();
+         pi < (const uint32_t)process_infos.size();
          pi++)
       already_registered =
-          (process_infos.GetProcessIDAtIndex(pi) == (uint32_t)kinfo.ki_pid);
+          (process_infos[pi].GetProcessID() == (uint32_t)kinfo.ki_pid);
 
     if (already_registered)
       continue;
@@ -216,11 +216,11 @@ uint32_t Host::FindProcesses(const ProcessInstanceInfoMatch &match_info,
         GetFreeBSDProcessArgs(&match_info, process_info)) {
       GetFreeBSDProcessCPUType(process_info);
       if (match_info.Matches(process_info))
-        process_infos.Append(process_info);
+        process_infos.push_back(process_info);
     }
   }
 
-  return process_infos.GetSize();
+  return process_infos.size();
 }
 
 bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) {
diff --git a/lldb/source/Host/linux/Host.cpp b/lldb/source/Host/linux/Host.cpp
index c31aac6784b2cd..3e002ca2f77a08 100644
--- a/lldb/source/Host/linux/Host.cpp
+++ b/lldb/source/Host/linux/Host.cpp
@@ -262,14 +262,14 @@ uint32_t Host::FindProcesses(const ProcessInstanceInfoMatch &match_info,
         continue;
 
       if (match_info.Matches(process_info)) {
-        process_infos.Append(process_info);
+        process_infos.push_back(process_info);
       }
     }
 
     closedir(dirproc);
   }
 
-  return process_infos.GetSize();
+  return process_infos.size();
 }
 
 bool Host::FindProcessThreads(const lldb::pid_t pid, TidMap &tids_to_attach) {
diff --git a/lldb/source/Host/macosx/objcxx/Host.mm b/lldb/source/Host/macosx/objcxx/Host.mm
index 233734109c41cd..0e668713d4bd51 100644
--- a/lldb/source/Host/macosx/objcxx/Host.mm
+++ b/lldb/source/Host/macosx/objcxx/Host.mm
@@ -660,11 +660,11 @@ static bool GetMacOSXProcessUserAndGroup(ProcessInstanceInfo &process_info) {
     if (GetMacOSXProcessCPUType(process_info)) {
       if (GetMacOSXProcessArgs(&match_info, process_info)) {
         if (match_info.Matches(process_info))
-          process_infos.Append(process_info);
+          process_infos.push_back(process_info);
       }
     }
   }
-  return process_infos.GetSize();
+  return process_infos.size();
 }
 
 bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) {
diff --git a/lldb/source/Host/netbsd/Host.cpp b/lldb/source/Host/netbsd/Host.cpp
index fb0be47e117189..10c0c78beed712 100644
--- a/lldb/source/Host/netbsd/Host.cpp
+++ b/lldb/source/Host/netbsd/Host.cpp
@@ -219,8 +219,8 @@ uint32_t Host::FindProcesses(const ProcessInstanceInfoMatch &match_info,
     // list if a process with given identifier is already registered there.
     if (proc_kinfo[i].p_nlwps > 1) {
       bool already_registered = false;
-      for (size_t pi = 0; pi < process_infos.GetSize(); pi++) {
-        if (process_infos.GetProcessIDAtIndex(pi) == proc_kinfo[i].p_pid) {
+      for (size_t pi = 0; pi < process_infos.size(); pi++) {
+        if (process_infos[pi].GetProcessID() == proc_kinfo[i].p_pid) {
           already_registered = true;
           break;
         }
@@ -241,13 +241,13 @@ uint32_t Host::FindProcesses(const ProcessInstanceInfoMatch &match_info,
         GetNetBSDProcessArgs(&match_info, process_info)) {
       GetNetBSDProcessCPUType(process_info);
       if (match_info.Matches(process_info))
-        process_infos.Append(process_info);
+        process_infos.push_back(process_info);
     }
   }
 
   kvm_close(kdp); /* XXX: we don't check for error here */
 
-  return process_infos.GetSize();
+  return process_infos.size();
 }
 
 bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) {
diff --git a/lldb/source/Host/openbsd/Host.cpp b/lldb/source/Host/openbsd/Host.cpp
index 8474bc9f671352..8fc8801775f33c 100644
--- a/lldb/source/Host/openbsd/Host.cpp
+++ b/lldb/source/Host/openbsd/Host.cpp
@@ -193,11 +193,11 @@ uint32_t Host::FindProcesses(const ProcessInstanceInfoMatch &match_info,
         GetOpenBSDProcessArgs(&match_info, process_info)) {
       GetOpenBSDProcessCPUType(process_info);
       if (match_info.Matches(process_info))
-        process_infos.Append(process_info);
+        process_infos.push_back(process_info);
     }
   }
 
-  return process_infos.GetSize();
+  return process_infos.size();
 }
 
 bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) {
diff --git a/lldb/source/Host/windows/Host.cpp b/lldb/source/Host/windows/Host.cpp
index 599d9480281237..28e78885519a72 100644
--- a/lldb/source/Host/windows/Host.cpp
+++ b/lldb/source/Host/windows/Host.cpp
@@ -156,10 +156,10 @@ uint32_t Host::FindProcesses(const ProcessInstanceInfoMatch &match_info,
       GetProcessExecutableAndTriple(handle, process);
 
       if (match_info.MatchAllProcesses() || match_info.Matches(process))
-        process_infos.Append(process);
+        process_infos.push_back(process);
     } while (Process32NextW(snapshot.get(), &pe));
   }
-  return process_infos.GetSize();
+  return process_infos.size();
 }
 
 bool Host::GetProcessInfo(lldb::pid_t pid, ProcessInstanceInfo &process_info) {
diff --git a/lldb/source/Plugins/Platform/MacOSX/PlatformAppleTVSimulator.cpp b/lldb/source/Plugins/Platform/MacOSX/PlatformAppleTVSimulator.cpp
index c4c5bdc02f2097..7e3e7c92f1804d 100644
--- a/lldb/source/Plugins/Platform/MacOSX/PlatformAppleTVSimulator.cpp
+++ b/lldb/source/Plugins/Platform/MacOSX/PlatformAppleTVSimulator.cpp
@@ -361,13 +361,12 @@ uint32_t PlatformAppleTVSimulator::FindProcesses(
 
   // Now we filter them down to only the TvOS triples
   for (uint32_t i = 0; i < n; ++i) {
-    const ProcessInstanceInfo &proc_info =
-        all_osx_process_infos.GetProcessInfoAtIndex(i);
+    const ProcessInstanceInfo &proc_info = all_osx_process_infos[i];
     if (proc_info.GetArchitecture().GetTriple().getOS() == llvm::Triple::TvOS) {
-      process_infos.Append(proc_info);
+      process_infos.push_back(proc_info);
     }
   }
-  return process_infos.GetSize();
+  return process_infos.size();
 }
 
 bool PlatformAppleTVSimulator::GetSupportedArchitectureAtIndex(uint32_t idx,
diff --git a/lldb/source/Plugins/Platform/MacOSX/PlatformAppleWatchSimulator.cpp b/lldb/source/Plugins/Platform/MacOSX/PlatformAppleWatchSimulator.cpp
index dc016b455ee798..e24923609d4a96 100644
--- a/lldb/source/Plugins/Platform/MacOSX/PlatformAppleWatchSimulator.cpp
+++ b/lldb/source/Plugins/Platform/MacOSX/PlatformAppleWatchSimulator.cpp
@@ -361,14 +361,13 @@ uint32_t PlatformAppleWatchSimulator::FindProcesses(
 
   // Now we filter them down to only the WatchOS triples
   for (uint32_t i = 0; i < n; ++i) {
-    const ProcessInstanceInfo &proc_info =
-        all_osx_process_infos.GetProcessInfoAtIndex(i);
+    const ProcessInstanceInfo &proc_info = all_osx_process_infos[i];
     if (proc_info.GetArchitecture().GetTriple().getOS() ==
         llvm::Triple::WatchOS) {
-      process_infos.Append(proc_info);
+      process_infos.push_back(proc_info);
     }
   }
-  return process_infos.GetSize();
+  return process_infos.size();
 }
 
 bool PlatformAppleWatchSimulator::GetSupportedArchitectureAtIndex(
diff --git a/lldb/source/Plugins/Platform/MacOSX/PlatformiOSSimulator.cpp b/lldb/source/Plugins/Platform/MacOSX/PlatformiOSSimulator.cpp
index 4fe82e34b6248d..375ddd07226264 100644
--- a/lldb/source/Plugins/Platform/MacOSX/PlatformiOSSimulator.cpp
+++ b/lldb/source/Plugins/Platform/MacOSX/PlatformiOSSimulator.cpp
@@ -366,13 +366,12 @@ PlatformiOSSimulator::FindProcesses(const ProcessInstanceInfoMatch &match_info,
 
   // Now we filter them down to only the iOS triples
   for (uint32_t i = 0; i < n; ++i) {
-    const ProcessInstanceInfo &proc_info =
-        all_osx_process_infos.GetProcessInfoAtIndex(i);
+    const ProcessInstanceInfo &proc_info = all_osx_process_infos[i];
     if (proc_info.GetArchitecture().GetTriple().getOS() == llvm::Triple::IOS) {
-      process_infos.Append(proc_info);
+      process_infos.push_back(proc_info);
     }
   }
-  return process_infos.GetSize();
+  return process_infos.size();
 }
 
 bool PlatformiOSSimulator::GetSupportedArchitectureAtIndex(uint32_t idx,
diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
index 500527221ebb9c..edbd408622f1ed 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp
@@ -2154,7 +2154,7 @@ bool GDBRemoteCommunicationClient::GetCurrentProcessInfo(bool allow_lazy) {
 uint32_t GDBRemoteCommunicationClient::FindProcesses(
     const ProcessInstanceInfoMatch &match_info,
     ProcessInstanceInfoList &process_infos) {
-  process_infos.Clear();
+  process_infos.clear();
 
   if (m_supports_qfProcessInfo) {
     StreamString packet;
@@ -2234,7 +2234,7 @@ uint32_t GDBRemoteCommunicationClient::FindProcesses(
         ProcessInstanceInfo process_info;
         if (!DecodeProcessInfoResponse(response, process_info))
           break;
-        process_infos.Append(process_info);
+        process_infos.push_back(process_info);
         response = StringExtractorGDBRemote();
       } while (SendPacketAndWaitForResponse("qsProcessInfo", response, false) ==
                PacketResult::Success);
@@ -2243,7 +2243,7 @@ uint32_t GDBRemoteCommunicationClient::FindProcesses(
       return 0;
     }
   }
-  return process_infos.GetSize();
+  return process_infos.size();
 }
 
 bool GDBRemoteCommunicationClient::GetUserName(uint32_t uid,
diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h
index ff3836d467a487..bd4a254433e93c 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.h
@@ -20,6 +20,7 @@
 #include "lldb/Host/File.h"
 #include "lldb/Utility/ArchSpec.h"
 #include "lldb/Utility/GDBRemote.h"
+#include "lldb/Utility/ProcessInfo.h"
 #include "lldb/Utility/StructuredData.h"
 #if defined(_WIN32)
 #include "lldb/Host/windows/PosixApi.h"
diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerCommon.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerCommon.cpp
index 3aec013ef6f3de..08d48985179980 100644
--- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerCommon.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerCommon.cpp
@@ -334,7 +334,7 @@ GDBRemoteCommunication::PacketResult
 GDBRemoteCommunicationServerCommon::Handle_qfProcessInfo(
     StringExtractorGDBRemote &packet) {
   m_proc_infos_index = 0;
-  m_proc_infos.Clear();
+  m_proc_infos.clear();
 
   ProcessInstanceInfoMatch match_info;
   packet.SetFilePos(::strlen("qfProcessInfo"));
@@ -416,10 +416,9 @@ GDBRemoteCommunicationServerCommon::Handle_qfProcessInfo(
 GDBRemoteCommunication::PacketResult
 GDBRemoteCommunicationServerCommon::Handle_qsProcessInfo(
     StringExtractorGDBRemote &packet) {
-  if (m_proc_infos_index < m_proc_infos.GetSize()) {
+  if (m_proc_infos_index < m_proc_infos.size()) {
     StreamString response;
-    CreateProcessInfoResponse(
-        m_proc_infos.GetProcessInfoAtIndex(m_proc_infos_index), response);
+    CreateProcessInfoResponse(m_proc_infos[m_proc_infos_index], response);
     ++m_proc_infos_index;
     return SendPacketNoLock(response.GetString());
   }
diff --git a/lldb/source/Target/Process.cpp b/lldb/source/Target/Process.cpp
index 7938d2b9a9b26b..af990c945bec77 100644
--- a/lldb/source/Target/Process.cpp
+++ b/lldb/source/Target/Process.cpp
@@ -2799,9 +2799,9 @@ Status Process::Attach(ProcessAttachInfo &attach_info) {
           match_info.GetProcessInfo() = attach_info;
           match_info.SetNameMatchType(NameMatch::Equals);
           platform_sp->FindProcesses(match_info, process_infos);
-          const uint32_t num_matches = process_infos.GetSize();
+          const uint32_t num_matches = process_infos.size();
           if (num_matches == 1) {
-            attach_pid = process_infos.GetProcessIDAtIndex(0);
+            attach_pid = process_infos[0].GetProcessID();
             // Fall through and attach using the above process ID
           } else {
             match_info.GetProcessInfo().GetExecutableFile().GetPath(
@@ -2810,7 +2810,7 @@ Status Process::Attach(ProcessAttachInfo &attach_info) {
               StreamString s;
               ProcessInstanceInfo::DumpTableHeader(s, true, false);
               for (size_t i = 0; i < num_matches; i++) {
-                process_infos.GetProcessInfoAtIndex(i).DumpAsTableRow(
+                process_infos[i].DumpAsTableRow(
                     s, platform_sp->GetUserIDResolver(), true, false);
               }
               error.SetErrorStringWithFormat(