David Green 7b6fae42f7 [InterleaveAccess] Check that binop shuffles have an undef second operand ...

It is expected that shuffles that we hoist through binops only have a single
vector operand, the other being undef/poison. The checks for
isDeInterleaveMaskOfFactor check that all the elements come from inside the
first vector, but with non-canonical shuffles the second operand could still
have a value. Add a quick check to make sure it is UndefValue as expected, to
make sure we don't run into problems with BinOpShuffles not using BinOps.

Fixes #61749

Differential Revision: https://reviews.llvm.org/D147306

2023-03-31 15:38:27 +01:00

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