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

[Henry Jiang via llvm-commits]

mustartt wrote:

@mstorsjo @cjacek I can land https://github.com/llvm/llvm-project/pull/132572 with the disable check for `strlen` and `wcslen` if you guys have tried the patch by it self locally? 

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