Use hasSameType.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@147407 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/SemaDecl.cpp

@@ -1379,8 +1379,7 @@ bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) {
   if (OldType != NewType &&
       !OldType->isDependentType() &&
       !NewType->isDependentType() &&
-      Context.getCanonicalType(OldType) !=
-      Context.getCanonicalType(NewType)) {
+      !Context.hasSameType(OldType, NewType)) {
     int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0;
     Diag(New->getLocation(), diag::err_redefinition_different_typedef)
       << Kind << NewType << OldType;