[llvm-readobj] Simplify startswith+drop_front pattern with consume_fr…

…ont. NFC

llvm/tools/llvm-readobj/ELFDumper.cpp

@@ -1423,12 +1423,12 @@ static std::string getGNUPtType(unsigned Arch, unsigned Type) {
     return std::string("<unknown>: ") + to_string(format_hex(Type, 1));
 
   // E.g. "PT_ARM_EXIDX" -> "EXIDX".
-  if (Seg.startswith("PT_ARM_"))
-    return Seg.drop_front(7).str();
+  if (Seg.consume_front("PT_ARM_"))
+    return Seg.str();
 
   // E.g. "PT_MIPS_REGINFO" -> "REGINFO".
-  if (Seg.startswith("PT_MIPS_"))
-    return Seg.drop_front(8).str();
+  if (Seg.consume_front("PT_MIPS_"))
+    return Seg.str();
 
   // E.g. "PT_LOAD" -> "LOAD".
   assert(Seg.startswith("PT_"));
@@ -3641,18 +3641,18 @@ static std::string getSectionTypeString(unsigned Machine, unsigned Type) {
   StringRef Name = getELFSectionTypeName(Machine, Type);
 
   // Handle SHT_GNU_* type names.
-  if (Name.startswith("SHT_GNU_")) {
-    if (Name == "SHT_GNU_HASH")
+  if (Name.consume_front("SHT_GNU_")) {
+    if (Name == "HASH")
       return "GNU_HASH";
     // E.g. SHT_GNU_verneed -> VERNEED.
-    return Name.drop_front(8).upper();
+    return Name.upper();
   }
 
   if (Name == "SHT_SYMTAB_SHNDX")
     return "SYMTAB SECTION INDICES";
 
-  if (Name.startswith("SHT_"))
-    return Name.drop_front(4).str();
+  if (Name.consume_front("SHT_"))
+    return Name.str();
   return getSectionTypeOffsetString(Type);
 }