Sanjay Patel 35827164c4 [InstCombine] remove shuffle mask canonicalization that creates undef elements
This is NFC-intended because SimplifyDemandedVectorElts() does the same
transform later. As discussed in D70641, we may want to change that
behavior, so we need to isolate where it happens.
2019-11-25 13:33:56 -05:00
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