Cleanup the way the debugger stores live registers when entering at a break...

src/arm/frames-arm.h

Index: src/arm/frames-arm.h
===================================================================
--- src/arm/frames-arm.h	(revision 5352)
+++ src/arm/frames-arm.h	(working copy)
@@ -96,11 +96,8 @@
 
 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 kCodeOffset = -1 * kPointerSize;
+  static const int kSPOffset = -1 * kPointerSize;
 
   static const int kSavedRegistersOffset = 0 * kPointerSize;