llvm-project

750d009b - [X86] combineConcatVectorOps - add concatenation handling for BITCAST nodes (#133913)

[X86] combineConcatVectorOps - add concatenation handling for BITCAST nodes (#133913) These nodes are effectively free, so we should only concatenate if the inner nodes will concatenate together. This also exposed a regression in canonicalizeShuffleWithOp that failed to realize it could potentially merge shuffles with a CONCAT_VECTORS node.