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

[A. Jiang via cfe-commits]

frederick-vs-ja wrote:

Reported 2 bugs for MSVC. (The first also affects standard cv-qualifiers.)
- https://developercommunity.visualstudio.com/t/cv-qualifiers-and-__restrict-in-the-temp/10609457
- https://developercommunity.visualstudio.com/t/__restrict-on-non-static-member-function/10609449

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