[clang] [Clang] Optimize -Wunsafe-buffer-usage. (PR #125492)

[Ilya Biryukov via cfe-commits]

https://github.com/ilya-biryukov commented:

@ivanaivanovska I only have NITs so far, could you address them?

I will make sure to finish the few other functions I have left "note to self" for, but I don't actually expect much to pop up there.
As soon as the comments are addressed, I think we are good to go from my perspective. (Would also need a pair of eyes from the owners, I think)

https://github.com/llvm/llvm-project/pull/125492