[clang] [Clang] Suppress mismatch warning for same-size pointer/integer casts (PR #203955)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

Pre-commit CI test failures are related.

It's still not entirely clear this is a good diagnostic to suppress, this is still undefined behavior at the language level. It's not clear why `-Wno-cast-function-type-mismatch` does not suffice. I've added some more reviewers for additional opinions.

https://github.com/llvm/llvm-project/pull/203955