[clang] [clang-tools-extra] [lldb] Reland: [clang] preserve class type sugar when taking pointer to member (PR #132401)

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eaeltsin wrote:

Memory Sanitizer complains about initialized value [here](https://github.com/llvm/llvm-project/blob/main/clang/include/clang/Serialization/ASTReader.h#L2438)

Will try the patch now.

https://github.com/llvm/llvm-project/pull/132401