[clang][Lex][NFC] Make some local variables const

Author: tbaederr

clang/lib/Lex/Lexer.cpp

@@ -57,7 +57,7 @@ using namespace clang;
 bool Token::isObjCAtKeyword(tok::ObjCKeywordKind objcKey) const {
   if (isAnnotation())
     return false;
-  if (IdentifierInfo *II = getIdentifierInfo())
+  if (const IdentifierInfo *II = getIdentifierInfo())
     return II->getObjCKeywordID() == objcKey;
   return false;
 }
@@ -66,7 +66,7 @@ bool Token::isObjCAtKeyword(tok::ObjCKeywordKind objcKey) const {
 tok::ObjCKeywordKind Token::getObjCKeywordID() const {
   if (isAnnotation())
     return tok::objc_not_keyword;
-  IdentifierInfo *specId = getIdentifierInfo();
+  const IdentifierInfo *specId = getIdentifierInfo();
   return specId ? specId->getObjCKeywordID() : tok::objc_not_keyword;
 }
 
@@ -1893,7 +1893,7 @@ bool Lexer::LexIdentifierContinue(Token &Result, const char *CurPtr) {
 
   // Fill in Result.IdentifierInfo and update the token kind,
   // looking up the identifier in the identifier table.
-  IdentifierInfo *II = PP->LookUpIdentifierInfo(Result);
+  const IdentifierInfo *II = PP->LookUpIdentifierInfo(Result);
   // Note that we have to call PP->LookUpIdentifierInfo() even for code
   // completion, it writes IdentifierInfo into Result, and callers rely on it.
 
@@ -4458,7 +4458,7 @@ bool Lexer::LexDependencyDirectiveToken(Token &Result) {
   if (Result.is(tok::raw_identifier)) {
     Result.setRawIdentifierData(TokPtr);
     if (!isLexingRawMode()) {
-      IdentifierInfo *II = PP->LookUpIdentifierInfo(Result);
+      const IdentifierInfo *II = PP->LookUpIdentifierInfo(Result);
       if (II->isHandleIdentifierCase())
         return PP->HandleIdentifier(Result);
     }

clang/lib/Lex/Preprocessor.cpp

@@ -817,8 +817,8 @@ bool Preprocessor::HandleIdentifier(Token &Identifier) {
   }
 
   // If this is a macro to be expanded, do it.
-  if (MacroDefinition MD = getMacroDefinition(&II)) {
-    auto *MI = MD.getMacroInfo();
+  if (const MacroDefinition MD = getMacroDefinition(&II)) {
+    const auto *MI = MD.getMacroInfo();
     assert(MI && "macro definition with no macro info?");
     if (!DisableMacroExpansion) {
       if (!Identifier.isExpandDisabled() && MI->isEnabled()) {