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

[via cfe-commits]

Sirraide wrote:

Update: it seems that the GCC behaviour is intended, and it actually makes a lot of sense now imo at least (see the initial pr comment for more info about this).

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