[clang] [clang] Fix nondeterminism in MemberPointerType (PR #137910)

[Maksim Ivanov via cfe-commits]

================
@@ -3610,7 +3611,7 @@ class MemberPointerType : public Type, public 
llvm::FoldingSetNode {
   }
 
   void Profile(llvm::FoldingSetNodeID &ID) {
-    Profile(ID, getPointeeType(), getQualifier(), 
getMostRecentCXXRecordDecl());
+    Profile(ID, getPointeeType(), getQualifier(), getCXXRecordDecl());
----------------
emaxx-google wrote:

The issue is transient - the reproducibility rate on the reproducer 
(https://pastebin.com/6aL6rmBe) is only 1%. Also it's not the pointer we have 
here that's problematic, but rather the fact of extra AST node loading inside 
the `FoldingSet` hash calculation operation.

https://github.com/llvm/llvm-project/pull/137910
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