llvm-project

1c0b2d3a - [mlir][vector] Replace unused shuffle operands / results with poison (#190763)

[mlir][vector] Replace unused shuffle operands / results with poison (#190763) If a shuffle operand is not used (as indicated by the mask), replace it with `ub.poison`. This may make the value dead and enable additional DCE. Also replace the entire shuffle op with `ub.poison` if all selected values are poisoned. Assisted-by: claude-4.6-opus-high