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

[Ilya Biryukov via cfe-commits]

https://github.com/ilya-biryukov approved this pull request.

Approving to land this and unblock our internal releases.
Obviously, I encourage to address the issues raised by other reviewers in the follow-ups.

In particular, the most easily actionable one is about the naming of the getter from @mizvekov . Let's wait for the comments and fix that quickly if a better name is suggested.

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