Revert r356996 "[DAG] Avoid smart constructor-based dangling nodes."

This patch appears to trigger very large compile time increases in
halide builds.

llvm-svn: 357116

1 files changed, 0 insertions, 12 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 4f6aa01cbc5..0b19b320f78 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -643,16 +643,6 @@ public:
   }
 };
 
-class WorklistInserter : public SelectionDAG::DAGUpdateListener {
-  DAGCombiner &DC;
-
-public:
-  explicit WorklistInserter(DAGCombiner &dc)
-      : SelectionDAG::DAGUpdateListener(dc.getDAG()), DC(dc) {}
-
-  void NodeInserted(SDNode *N) override { DC.AddToWorklist(N); }
-};
-
 } // end anonymous namespace
 
 //===----------------------------------------------------------------------===//
@@ -1405,8 +1395,6 @@ void DAGCombiner::Run(CombineLevel AtLevel) {
   LegalOperations = Level >= AfterLegalizeVectorOps;
   LegalTypes = Level >= AfterLegalizeTypes;
 
-  WorklistInserter AddNodes(*this);
-
   // Add all the dag nodes to the worklist.
   for (SDNode &Node : DAG.allnodes())
     AddToWorklist(&Node);