[turbofan] Remove SetExistsVirtualAllocate side-channel.

src/compiler/escape-analysis-reducer.h

 // 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.
 
 #ifndef V8_COMPILER_ESCAPE_ANALYSIS_REDUCER_H_
 #define V8_COMPILER_ESCAPE_ANALYSIS_REDUCER_H_
 
 #include "src/bit-vector.h"
 #include "src/compiler/escape-analysis.h"
 #include "src/compiler/graph-reducer.h"
@@ skipping 11 matching lines @@
 // Forward declarations.
 class JSGraph;
 
 
 class EscapeAnalysisReducer final : public AdvancedReducer {
  public:
   EscapeAnalysisReducer(Editor* editor, JSGraph* jsgraph,
                         EscapeAnalysis* escape_analysis, Zone* zone);
 
   Reduction Reduce(Node* node) final;
-  void SetExistsVirtualAllocate(bool exists) {
-    exists_virtual_allocate_ = exists;
-  }
   void VerifyReplacement() const;
 
  private:
   Reduction ReduceLoad(Node* node);
   Reduction ReduceStore(Node* node);
   Reduction ReduceAllocate(Node* node);
   Reduction ReduceFinishRegion(Node* node);
   Reduction ReduceReferenceEqual(Node* node);
   Reduction ReduceObjectIsSmi(Node* node);
   Reduction ReduceFrameStateUses(Node* node);
@@ skipping 16 matching lines @@
   bool exists_virtual_allocate_;
 
   DISALLOW_COPY_AND_ASSIGN(EscapeAnalysisReducer);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_ESCAPE_ANALYSIS_REDUCER_H_