[llvm] [InstCombine] Drop range metadata when simplifying `fshl` with demanded bits (PR #173864)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

Okay. I don't object to fixing miscompilations that are generated by mutating existing tests. I am just wondering if the range list is still useful for CallBases. If they just contain a single range, they should be canonicalized into the range attribute.

https://github.com/llvm/llvm-project/pull/173864