[AST] Match the FoldingSetNodeID computed before and after creating TypedefType (llvm#157662)

At some point the call to static `TypedefType::Profile` inside
`ASTContext::getTypedefType` got out-of-sync with the non-static
`TypedefType::Profile`.

This seem to cause some bad performance patterns with `FoldingSet` and
are seeing 10x increases in compile times in certain scenarios. After
this commit, the compile times go back to normal.

This commit does not include tests or benchmarks because we want to land
this ASAP to unbreak our deployment. I will work on adding asserts,
tests or benchmarks in a follow-up.

Author: ilya-biryukov

clang/lib/AST/ASTContext.cpp

@@ -5316,7 +5316,8 @@ ASTContext::getTypedefType(ElaboratedTypeKeyword Keyword,
   }
 
   llvm::FoldingSetNodeID ID;
-  TypedefType::Profile(ID, Keyword, Qualifier, Decl, UnderlyingType);
+  TypedefType::Profile(ID, Keyword, Qualifier, Decl,
+                       *TypeMatchesDeclOrNone ? QualType() : UnderlyingType);
 
   void *InsertPos = nullptr;
   if (FoldingSetPlaceholder<TypedefType> *Placeholder =