[clang] [Clang] [Sema] Improve support for `__restrict`-qualified member functions (PR #83855)

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Sirraide wrote:

> @Sirraide, wait, did we all miss this PR? I am so sorry

This was a while ago, but I recall talking to @AaronBallman about this one several times, and I think our conclusion at some point was that it wasn’t worth supporting this divergent behaviour or sth like that but I could be wrong (we also had a discussion about in one of the Wednesday meetings iirc).

https://github.com/llvm/llvm-project/pull/83855