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

[Arthur Eubanks via cfe-commits]

aeubanks wrote:

@mizvekov we're seeing pcm non-determinism after this reland, does anything jump out at you?

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