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[X86][Costmodel]
getReplicationShuffleCost()
: promote 1 bit-wide el…
…ements to 32 bit when have AVX512DQ I believe, this effectively completes `X86TTIImpl::getReplicationShuffleCost()` for AVX512, other than the question of handling plain AVX512F, where we end up with some really ugly "shuffles", but then is there any CPU's that support AVX512, but not AVX512DQ/AVX512BW? Reviewed By: RKSimon Differential Revision: https://reviews.llvm.org/D114315
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