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As discussed on PR28136, lowerShuffleAsRepeatedMaskAndLanePermute was attempting to match repeated masks at the 128-bit level and then permute the resultant lanes at the 128-bit (AVX1) or 64-bit (AVX2) sub-lane level. This change allows us to create the repeated masks at the sub-lane level (and then concat them together to create a 128-bit repeated mask) and then select which sub-lane to permute. This has no effect on the AVX1 codegen. Fixes PR28136. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@275543 91177308-0d34-0410-b5e6-96231b3b80d8
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