[llvm] [VectorCombine] Fold "(or (zext (bitcast X)), (shl (zext (bitcast Y)), C))" -> "(bitcast (concat X, Y))" MOVMSK bool mask style patterns (PR #119559)

[David Green via llvm-commits]

https://github.com/davemgreen commented:

Is it worth having some tests that are not in PhaseOrdering too? In case the phase ordering test changes and we don't realise we have lost the test coverage.

https://github.com/llvm/llvm-project/pull/119559