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

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mugiwaraluffy56 wrote:

Yes parts of this PR were initially drafted with the assistance of an LLM.
I reviewed, tested, and take responsibility for the changes and discussion here.
Happy to add more details or adjust the PR (including converting it to Draft) as the design discussion continues.

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