Nuno Lopes 23c2175945 [LowerMatrixIntrinsics] Use poison instead of undef as placeholder [NFC] ...

These values don't propagate to the output; they are always replaced with a subsequent shuffle
or insertelement.
Tested equivalence with Alive2, e.g., https://alive2.llvm.org/ce/z/fj4s78.

2023-07-18 09:54:41 +01:00

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