[llvm] [InstCombine] Fold bitwise logic with funnel shifts (PR #77460)

[Yingwei Zheng via llvm-commits]

dtcxzyw wrote:

> This also applies to other bitwise intrinsics, e.g. bitreverse (https://alive2.llvm.org/ce/z/Gut-vS) and bswap. I think it would be preferable to directly structure this in terms of "bitwise op with two equal intrinsic IDs".

Done.

https://github.com/llvm/llvm-project/pull/77460