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This PR continues the effort made in https://discourse.llvm.org/t/rfc-strlen-loop-idiom-recognition-folding/55848 and https://reviews.llvm.org/D83392 and https://reviews.llvm.org/D88460 to extend `LoopIdiomRecognize` to find and replace loops of the form ```c base = str; while (*str) ++str; ``` and transforming the `strlen` loop idiom into the appropriate `strlen` and `wcslen` library call which will give a small performance boost if replaced. ```c str = base + strlen(base) len = str - base ``` --------- Co-authored-by: Michael Kruse <github@meinersbur.de>