[turbofan] Remove SetExistsVirtualAllocate side-channel.

src/compiler/escape-analysis-reducer.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/escape-analysis-reducer.h"
 
 #include "src/compiler/js-graph.h"
 #include "src/counters.h"
 
 namespace v8 {
@@ skipping 10 matching lines @@
 #endif  // DEBUG
 
 EscapeAnalysisReducer::EscapeAnalysisReducer(Editor* editor, JSGraph* jsgraph,
                                              EscapeAnalysis* escape_analysis,
                                              Zone* zone)
     : AdvancedReducer(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()) &&
       fully_reduced_.Contains(node->id())) {
     return NoChange();
   }
 
   switch (node->opcode()) {
     case IrOpcode::kLoadField:
     case IrOpcode::kLoadElement:
@@ skipping 315 matching lines @@
   GraphReducer graph_reducer(zone(), jsgraph()->graph());
   EscapeAnalysisVerifier verifier(&graph_reducer, escape_analysis());
   graph_reducer.AddReducer(&verifier);
   graph_reducer.ReduceGraph();
 #endif  // DEBUG
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8