[turbofan] Make FieldAccess::name usable in practice.

src/compiler/access-builder.h

 // Copyright 2014 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_ACCESS_BUILDER_H_
 #define V8_COMPILER_ACCESS_BUILDER_H_
 
 #include "src/compiler/simplified-operator.h"
 
 namespace v8 {
@@ skipping 112 matching lines @@
 
   // ===========================================================================
   // Access to activation records on the stack (based on frame pointer).
 
   // Provides access to the next frame pointer in a stack frame.
   static FieldAccess ForFrameCallerFramePtr();
 
   // Provides access to the marker in a stack frame.
   static FieldAccess ForFrameMarker();
 
+  // ===========================================================================
+
+  // Helper to populate {FieldAccess::name} for tracing.
+  static const char* GetNameForTracing(Handle<Name> name, Zone* zone);
+
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(AccessBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_ACCESS_BUILDER_H_