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6663330bc8
Unlike VPERMILPS, VPERMILPD can have non-repeating masks in each 128-bit subvector, we weren't accounting for this when folding vperm2f128(vpermilpd(x,c),vpermilpd(y,c)) -> vpermilpd(vperm2f128(x,y),c). I'm intending to add support for this but wanted to get a minimal fix in first for merging into 12.xx. Fixes PR48908
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