llvm-project

790bee99 - [VectorCombine] Remove dead node immediately in VectorCombine (#149047)

[VectorCombine] Remove dead node immediately in VectorCombine (#149047) The vector combiner will process all instructions as it first loops through the function, adding any newly added and deleted instructions to a worklist which is then processed when all nodes are done. These leaves extra uses in the graph as the initial processing is performed, leading to sub-optimal decisions being made for other combines. This changes it so that trivially dead instructions are removed immediately. The main changes that this requires is to make sure iterator invalidation does not occur.