[turbofan] Remove SetExistsVirtualAllocate side-channel.

src/compiler/escape-analysis-reducer.cc

Index: src/compiler/escape-analysis-reducer.cc
diff --git a/src/compiler/escape-analysis-reducer.cc b/src/compiler/escape-analysis-reducer.cc
index 313b6396dd3d6f9cf5b91c5ac87d7c55466a723c..3533426a434b365cbf28bef19a0183cc136720bf 100644
--- a/src/compiler/escape-analysis-reducer.cc
+++ b/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()) &&