[VectorCombine] Shrink loads used in shufflevector rebroadcasts (#128938)
Attempt to shrink the size of vector loads where only some of the incoming lanes are used for rebroadcasts in shufflevector instructions.
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Co-authored-by: Leon Clark <leoclark@amd.com>
Co-authored-by: Simon Pilgrim <llvm-dev@redking.me.uk>