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This uses the shuffle mask cost from D98206 to give a better cost of MVE VREV instructions. This helps especially in VectorCombine where the cost of shuffles is used to reorder bitcasts, which this helps keep the phase ordering test for fp16 reductions producing optimal code. The isVREVMask has been moved to a header file to allow it to be used across target transform and isel lowering. Differential Revision: https://reviews.llvm.org/D98210
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