Refactor BreakLocationIterator.

src/ppc/assembler-ppc.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 641 matching lines @@
   static const int kPatchReturnSequenceAddressOffset = 0 * kInstrSize;
 
   // Distance between start of patched debug break slot and the emitted address
   // to jump to.
   // Patched debug break slot code is a FIXED_SEQUENCE:
   //   mov r0, <address>
   //   mtlr r0
   //   blrl
   static const int kPatchDebugBreakSlotAddressOffset = 0 * kInstrSize;
 
-  // This is the length of the BreakLocationIterator::SetDebugBreakAtReturn()
+  // This is the length of the BreakLocation::SetDebugBreakAtReturn()
   // code patch FIXED_SEQUENCE
   static const int kJSReturnSequenceInstructions = kMovInstructions + 3;
+  static const int kJSReturnSequenceLength =
+      kJSReturnSequenceInstructions * kInstrSize;
 
   // This is the length of the code sequence from SetDebugBreakAtSlot()
   // FIXED_SEQUENCE
   static const int kDebugBreakSlotInstructions = kMovInstructions + 2;
   static const int kDebugBreakSlotLength =
       kDebugBreakSlotInstructions * kInstrSize;
 
   static inline int encode_crbit(const CRegister& cr, enum CRBit crbit) {
     return ((cr.code() * CRWIDTH) + crbit);
   }
@@ skipping 756 matching lines @@
 
 
 class EnsureSpace BASE_EMBEDDED {
  public:
   explicit EnsureSpace(Assembler* assembler) { assembler->CheckBuffer(); }
 };
 }
 }  // namespace v8::internal
 
 #endif  // V8_PPC_ASSEMBLER_PPC_H_