[turbofan] Unify escape analysis offset calculation.

src/compiler/escape-analysis.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_H_
 #define V8_COMPILER_ESCAPE_ANALYSIS_H_
 
 #include "src/compiler/graph.h"
 
 namespace v8 {
@@ skipping 33 matching lines @@
   void ProcessAllocationUsers(Node* node);
   void ProcessAllocation(Node* node);
   void ProcessFinishRegion(Node* node);
   void ProcessCall(Node* node);
   void ProcessStart(Node* node);
   bool ProcessEffectPhi(Node* node);
   void ProcessLoadFromPhi(int offset, Node* from, Node* node,
                           VirtualState* states);
 
   void ForwardVirtualState(Node* node);
-  int OffsetFromAccess(Node* node);
   VirtualState* CopyForModificationAt(VirtualState* state, Node* node);
   VirtualObject* CopyForModificationAt(VirtualObject* obj, VirtualState* state,
                                        Node* node);
 
   Node* replacement(Node* node);
   Node* ResolveReplacement(Node* node);
   bool SetReplacement(Node* node, Node* rep);
   bool UpdateReplacement(VirtualState* state, Node* node, Node* rep);
 
   VirtualObject* GetVirtualObject(VirtualState* state, Node* node);
@@ skipping 13 matching lines @@
   MergeCache* cache_;
 
   DISALLOW_COPY_AND_ASSIGN(EscapeAnalysis);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_ESCAPE_ANALYSIS_H_