[turbofan] Remove SetExistsVirtualAllocate side-channel.

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/1973323002
Cr-Commit-Position: refs/heads/master@{#36274}

src/compiler/escape-analysis-reducer.cc

@@ -28,8 +28,7 @@ EscapeAnalysisReducer::EscapeAnalysisReducer(Editor* editor, JSGraph* jsgraph,
       escape_analysis_(escape_analysis),
       zone_(zone),
       fully_reduced_(static_cast<int>(jsgraph->graph()->NodeCount() * 2), zone),
-      exists_virtual_allocate_(true) {}
-
+      exists_virtual_allocate_(escape_analysis->ExistsVirtualAllocate()) {}
 
 Reduction EscapeAnalysisReducer::Reduce(Node* node) {
   if (node->id() < static_cast<NodeId>(fully_reduced_.length()) &&

src/compiler/escape-analysis-reducer.h

@@ -29,9 +29,6 @@ class EscapeAnalysisReducer final : public AdvancedReducer {
                         EscapeAnalysis* escape_analysis, Zone* zone);
 
   Reduction Reduce(Node* node) final;
-  void SetExistsVirtualAllocate(bool exists) {
-    exists_virtual_allocate_ = exists;
-  }
   void VerifyReplacement() const;
 
  private:

src/compiler/pipeline.cc

@@ -932,8 +932,6 @@ struct EscapeAnalysisPhase {
     JSGraphReducer graph_reducer(data->jsgraph(), temp_zone);
     EscapeAnalysisReducer escape_reducer(&graph_reducer, data->jsgraph(),
                                          &escape_analysis, temp_zone);
-    escape_reducer.SetExistsVirtualAllocate(
-        escape_analysis.ExistsVirtualAllocate());
     AddReducer(data, &graph_reducer, &escape_reducer);
     graph_reducer.ReduceGraph();
     escape_reducer.VerifyReplacement();