[TableGen] Use range-based for loops (NFC) (#144250)

Author: kazutakahirata

clang/utils/TableGen/ClangCommentCommandInfoEmitter.cpp

@@ -78,10 +78,10 @@ void clang::EmitClangCommentCommandInfo(const RecordKeeper &Records,
 
 static std::string MangleName(StringRef Str) {
   std::string Mangled;
-  for (unsigned i = 0, e = Str.size(); i != e; ++i) {
-    switch (Str[i]) {
+  for (char C : Str) {
+    switch (C) {
     default:
-      Mangled += Str[i];
+      Mangled += C;
       break;
     case '(':
       Mangled += "lparen";
@@ -122,9 +122,8 @@ void clang::EmitClangCommentCommandList(const RecordKeeper &Records,
      << "#endif\n";
 
   ArrayRef<const Record *> Tags = Records.getAllDerivedDefinitions("Command");
-  for (size_t i = 0, e = Tags.size(); i != e; ++i) {
-    const Record &Tag = *Tags[i];
-    std::string MangledName = MangleName(Tag.getValueAsString("Name"));
+  for (const Record *Tag : Tags) {
+    std::string MangledName = MangleName(Tag->getValueAsString("Name"));
 
     OS << "COMMENT_COMMAND(" << MangledName << ")\n";
   }

clang/utils/TableGen/ClangCommentHTMLNamedCharacterReferenceEmitter.cpp

@@ -37,9 +37,9 @@ static bool translateCodePointToUTF8(unsigned CodePoint,
 
   raw_svector_ostream OS(CLiteral);
   OS << "\"";
-  for (size_t i = 0, e = UTF8.size(); i != e; ++i) {
+  for (char C : UTF8) {
     OS << "\\x";
-    OS.write_hex(static_cast<unsigned char>(UTF8[i]));
+    OS.write_hex(static_cast<unsigned char>(C));
   }
   OS << "\"";
 

clang/utils/TableGen/ClangDiagnosticsEmitter.cpp

@@ -1794,8 +1794,8 @@ static std::string getDiagCategoryEnum(StringRef name) {
   if (name.empty())
     return "DiagCat_None";
   SmallString<256> enumName = StringRef("DiagCat_");
-  for (StringRef::iterator I = name.begin(), E = name.end(); I != E; ++I)
-    enumName += isalnum(*I) ? *I : '_';
+  for (char C : name)
+    enumName += isalnum(C) ? C : '_';
   return std::string(enumName);
 }
 

clang/utils/TableGen/ClangOpcodesEmitter.cpp

@@ -224,8 +224,7 @@ void ClangOpcodesEmitter::EmitProto(raw_ostream &OS, StringRef N,
   auto Args = R->getValueAsListOfDefs("Args");
   Enumerate(R, N, [&OS, &Args](ArrayRef<const Record *> TS, const Twine &ID) {
     OS << "bool emit" << ID << "(";
-    for (size_t I = 0, N = Args.size(); I < N; ++I) {
-      const auto *Arg = Args[I];
+    for (const Record *Arg : Args) {
       bool AsRef = Arg->getValueAsBit("AsRef");
       auto Name = Arg->getValueAsString("Name");