[clang] [Clang] Allow -Wcast-function-type for same-width pointer-integer conversions (PR #178390)

[Aaron Ballman via cfe-commits]

https://github.com/AaronBallman requested changes to this pull request.

Marking as requested changes while the discussion continues on the original issue, just so we don't accidentally land this. I think it'd make sense to make this a Draft PR until the issue discussion settles.

https://github.com/llvm/llvm-project/pull/178390