[clang] [clang-tools-extra] Reland: [clang] NFC: Clear some uses of MemberPointerType::getClass (PR #132317)

[Matheus Izvekov via cfe-commits]

mizvekov wrote:

You mean crashes caused by this fix, or do you mean crashes not fixed by it?

In any case, I won't be available to revert anything until tomorrow.

You can go ahead and revert, but I am afraid it won't be straightforward.

https://github.com/llvm/llvm-project/pull/132317