[InstCombine] Fix worklist management for multi-use demanded element fold

Add the old instruction to the worklist, so it can be DCEd in the
same iteration.

1 files changed, 1 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp b/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
index f077f6f29030..7ffa30b54b5f 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
@@ -594,6 +594,7 @@ Instruction *InstCombinerImpl::visitExtractElementInst(ExtractElementInst &EI) {
                   SrcVec, DemandedElts, UndefElts, 0 /* Depth */,
                   true /* AllowMultipleUsers */)) {
             if (V != SrcVec) {
+              Worklist.addValue(SrcVec);
               SrcVec->replaceAllUsesWith(V);
               return &EI;
             }