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

[via cfe-commits]

eaeltsin wrote:

Well, to be honest, I'm not completely sure these are the same problems, these are just sanitizer finding for the same compilation.

Here is the [MSan finding](https://gist.github.com/eaeltsin/834192fe5d8bbbc061e1488f113e34e1). Please note my source is somewhat behind the head, so locations might be off a bit


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