[llvm] [LoopIdiom] Don't introduce `wcslen` calls when `wchar` size is not the default (PR #213629)

[Ömer Sinan Ağacan via llvm-commits]

osa1 wrote:

@efriedma-quic

> LibCallSimplifier::optimizeWcslen is very broken if the char width is wrong.

I'm not sure what you mean by "char width is wrong"?

`optimizeWcslen` checks the module's wide char width and optimizes accordingly. I don't see a reason to disable it.

https://github.com/llvm/llvm-project/pull/213629