[clang] [Clang] [Sema] Handle `this` in `__restrict`-qualified member functions properly (PR #83187)

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Sirraide wrote:

> Thank you for the fix! This seems to fix quite a few issues because it also addresses:
> 
> #42411 #18121 #11039

I also checked for other open issues, but I see you were more successful than me in finding some; I’ll take a look at those and add tests for them as well.



https://github.com/llvm/llvm-project/pull/83187