[llvm] [Transforms] LoopIdiomRecognize recognize strlen and wcslen (PR #108985)

[Jacek Caban via llvm-commits]

cjacek wrote:

> Indeed, this is a recurring problem when implementing many standard C functions. Wine does actually build some source files with -fno-builtin, exactly for this reason - https://github.com/wine-mirror/wine/blob/wine-10.4/tools/makedep.c#L3287-L3294. But this file lies outside of what those patterns cover.

Yes, I agree, we should extend `-fno-builtin` use in Wine to cover that.

https://github.com/llvm/llvm-project/pull/108985