[clang] [clang-tools-extra] [clang] improve class type sugar preservation in pointers to members (PR #130537)

[Matheus Izvekov via cfe-commits]

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@@ -1355,7 +1355,7 @@ class BlockPointerTypeLoc : public PointerLikeTypeLoc<BlockPointerTypeLoc,
 };
 
 struct MemberPointerLocInfo : public PointerLikeLocInfo {
-  TypeSourceInfo *ClassTInfo;
+  void *QualifierData = nullptr;
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mizvekov wrote:

This is actually not just an issue with NestedSpecifierLoc.

TypeLoc provides access to the opaque data through this void pointer, through the getOpaqueData method.
I added a comment there, but chances are low somebody is going to do something about it anytime soon :)

There are far worse issues just on TypeLoc itself which are still there from the initial implementation 15 years ago.

https://github.com/llvm/llvm-project/pull/130537