[clang] [clang] Strict aliasing warning ala GCC [PR50066] (PR #74155)

[Vlad Serebrennikov via cfe-commits]

https://github.com/Endilll commented:

Thank you for your efforts!
I scratched the surface a bit; not qualified to do an in-depth review.
Can you also add a release note?

https://github.com/llvm/llvm-project/pull/74155