[lldb] [Process/NetBSD] Correct DS/ES/FS/GS register sizes

Fix DS/ES/FS/GS register sizes in getter/setter for NetBSD.  Apparently
only CS and SS registers are specified as 64/32-bit in LLDB, while
the others are specified as 16-bit.

Differential Revision: https://reviews.llvm.org/D91090

lldb/source/Plugins/Process/NetBSD/NativeRegisterContextNetBSD_x86_64.cpp

@@ -539,19 +539,19 @@ NativeRegisterContextNetBSD_x86_64::ReadRegister(const RegisterInfo *reg_info,
     reg_value = (uint64_t)m_gpr.regs[_REG_CS];
     break;
   case lldb_fs_x86_64:
-    reg_value = (uint64_t)m_gpr.regs[_REG_FS];
+    reg_value = (uint16_t)m_gpr.regs[_REG_FS];
     break;
   case lldb_gs_x86_64:
-    reg_value = (uint64_t)m_gpr.regs[_REG_GS];
+    reg_value = (uint16_t)m_gpr.regs[_REG_GS];
     break;
   case lldb_ss_x86_64:
     reg_value = (uint64_t)m_gpr.regs[_REG_SS];
     break;
   case lldb_ds_x86_64:
-    reg_value = (uint64_t)m_gpr.regs[_REG_DS];
+    reg_value = (uint16_t)m_gpr.regs[_REG_DS];
     break;
   case lldb_es_x86_64:
-    reg_value = (uint64_t)m_gpr.regs[_REG_ES];
+    reg_value = (uint16_t)m_gpr.regs[_REG_ES];
     break;
 #else
   case lldb_rax_x86_64:
@@ -588,19 +588,19 @@ NativeRegisterContextNetBSD_x86_64::ReadRegister(const RegisterInfo *reg_info,
     reg_value = (uint32_t)m_gpr.r_cs;
     break;
   case lldb_fs_x86_64:
-    reg_value = (uint32_t)m_gpr.r_fs;
+    reg_value = (uint16_t)m_gpr.r_fs;
     break;
   case lldb_gs_x86_64:
-    reg_value = (uint32_t)m_gpr.r_gs;
+    reg_value = (uint16_t)m_gpr.r_gs;
     break;
   case lldb_ss_x86_64:
     reg_value = (uint32_t)m_gpr.r_ss;
     break;
   case lldb_ds_x86_64:
-    reg_value = (uint32_t)m_gpr.r_ds;
+    reg_value = (uint16_t)m_gpr.r_ds;
     break;
   case lldb_es_x86_64:
-    reg_value = (uint32_t)m_gpr.r_es;
+    reg_value = (uint16_t)m_gpr.r_es;
     break;
 #endif
   case lldb_fctrl_x86_64:
@@ -830,19 +830,19 @@ Status NativeRegisterContextNetBSD_x86_64::WriteRegister(
     m_gpr.regs[_REG_CS] = reg_value.GetAsUInt64();
     break;
   case lldb_fs_x86_64:
-    m_gpr.regs[_REG_FS] = reg_value.GetAsUInt64();
+    m_gpr.regs[_REG_FS] = reg_value.GetAsUInt16();
     break;
   case lldb_gs_x86_64:
-    m_gpr.regs[_REG_GS] = reg_value.GetAsUInt64();
+    m_gpr.regs[_REG_GS] = reg_value.GetAsUInt16();
     break;
   case lldb_ss_x86_64:
     m_gpr.regs[_REG_SS] = reg_value.GetAsUInt64();
     break;
   case lldb_ds_x86_64:
-    m_gpr.regs[_REG_DS] = reg_value.GetAsUInt64();
+    m_gpr.regs[_REG_DS] = reg_value.GetAsUInt16();
     break;
   case lldb_es_x86_64:
-    m_gpr.regs[_REG_ES] = reg_value.GetAsUInt64();
+    m_gpr.regs[_REG_ES] = reg_value.GetAsUInt16();
     break;
 #else
   case lldb_rax_x86_64:
@@ -879,19 +879,19 @@ Status NativeRegisterContextNetBSD_x86_64::WriteRegister(
     m_gpr.r_cs = reg_value.GetAsUInt32();
     break;
   case lldb_fs_x86_64:
-    m_gpr.r_fs = reg_value.GetAsUInt32();
+    m_gpr.r_fs = reg_value.GetAsUInt16();
     break;
   case lldb_gs_x86_64:
-    m_gpr.r_gs = reg_value.GetAsUInt32();
+    m_gpr.r_gs = reg_value.GetAsUInt16();
     break;
   case lldb_ss_x86_64:
     m_gpr.r_ss = reg_value.GetAsUInt32();
     break;
   case lldb_ds_x86_64:
-    m_gpr.r_ds = reg_value.GetAsUInt32();
+    m_gpr.r_ds = reg_value.GetAsUInt16();
     break;
   case lldb_es_x86_64:
-    m_gpr.r_es = reg_value.GetAsUInt32();
+    m_gpr.r_es = reg_value.GetAsUInt16();
     break;
 #endif
   case lldb_fctrl_x86_64: