Reverting 3174. Aka reapplying 3150, 3151 and 3159. Aka api accessor

src/arm/frames-arm.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 82 matching lines @@
   static const int kCallerFPOffset      = -3 * kPointerSize;
 };
 
 
 class ExitFrameConstants : public AllStatic {
  public:
   // Exit frames have a debug marker on the stack.
   static const int kSPDisplacement = -1 * kPointerSize;
 
   // The debug marker is just above the frame pointer.
-  static const int kDebugMarkOffset = -1 * kPointerSize;
+  static const int kCodeOffset = -1 * kPointerSize;
 
   static const int kSavedRegistersOffset = 0 * kPointerSize;
 
   // The caller fields are below the frame pointer on the stack.
   static const int kCallerFPOffset = +0 * kPointerSize;
   // The calling JS function is between FP and PC.
   static const int kCallerPCOffset = +2 * kPointerSize;
 
   // FP-relative displacement of the caller's SP.  It points just
   // below the saved PC.
@@ skipping 39 matching lines @@
 
 inline Object* JavaScriptFrame::function_slot_object() const {
   const int offset = JavaScriptFrameConstants::kFunctionOffset;
   return Memory::Object_at(fp() + offset);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_FRAMES_ARM_H_