Sanjay Patel 192cb71836 [InstCombine] avoid crashing on select-shuffle detection ...

As mentioned in the post-commit comments of D81013 -
the mask check API has to assume the shuffle is
not length-changing, but we have not ruled that out
in this code. Use the ShuffleVectorInst call instead.

2020-06-04 17:27:14 -04:00

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