[llvm] [VectorCombine] foldShuffleToIdentity - peek through bitcasts to see if they come from the same value to form identity sequence (PR #98334)

[David Green via llvm-commits]

https://github.com/davemgreen commented:

Sorry I almost missed this one. I think it looks OK - is it worth adding a vector-combine (non-phaseordering) test in case the phase-ordering test behaves differently in the future?

https://github.com/llvm/llvm-project/pull/98334