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

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

Thanks @vitalybuka - I've now reproduced this and am working on a fix.

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