[clang][NFC] Add const qualifier in Sema::isIncompatibleTypedef

Author: Endilll

clang/include/clang/Sema/Sema.h

@@ -3309,7 +3309,7 @@ class Sema final : public SemaBase {
   /// Subroutines of ActOnDeclarator().
   TypedefDecl *ParseTypedefDecl(Scope *S, Declarator &D, QualType T,
                                 TypeSourceInfo *TInfo);
-  bool isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New);
+  bool isIncompatibleTypedef(const TypeDecl *Old, TypedefNameDecl *New);
 
   /// Describes the kind of merge to perform for availability
   /// attributes (including "deprecated", "unavailable", and "availability").

clang/lib/Sema/SemaDecl.cpp

@@ -2465,9 +2465,9 @@ NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned ID,
 /// entity if their types are the same.
 /// FIXME: This is notionally doing the same thing as ASTReaderDecl's
 /// isSameEntity.
-static void filterNonConflictingPreviousTypedefDecls(Sema &S,
-                                                     TypedefNameDecl *Decl,
-                                                     LookupResult &Previous) {
+static void
+filterNonConflictingPreviousTypedefDecls(Sema &S, const TypedefNameDecl *Decl,
+                                         LookupResult &Previous) {
   // This is only interesting when modules are enabled.
   if (!S.getLangOpts().Modules && !S.getLangOpts().ModulesLocalVisibility)
     return;
@@ -2504,9 +2504,9 @@ static void filterNonConflictingPreviousTypedefDecls(Sema &S,
   Filter.done();
 }
 
-bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) {
+bool Sema::isIncompatibleTypedef(const TypeDecl *Old, TypedefNameDecl *New) {
   QualType OldType;
-  if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old))
+  if (const TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old))
     OldType = OldTypedef->getUnderlyingType();
   else
     OldType = Context.getTypeDeclType(Old);