[debugger] introduce abstract interface for break location.

src/assembler.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 600 matching lines @@
   INLINE(Address debug_call_address());
   INLINE(void set_debug_call_address(Address target));
 
   // Wipe out a relocation to a fixed value, used for making snapshots
   // reproducible.
   INLINE(void WipeOut());
 
   template<typename StaticVisitor> inline void Visit(Heap* heap);
   inline void Visit(Isolate* isolate, ObjectVisitor* v);
 
-  // Check whether this return sequence has been patched
-  // with a call to the debugger.
-  INLINE(bool IsPatchedReturnSequence());
-
   // Check whether this debug break slot has been patched with a call to the
   // debugger.
-  INLINE(bool IsPatchedDebugBreakSlotSequence());
+  bool IsPatchedDebugBreakSlotSequence();
 
 #ifdef DEBUG
   // Check whether the given code contains relocation information that
   // either is position-relative or movable by the garbage collector.
   static bool RequiresRelocation(const CodeDesc& desc);
 #endif
 
 #ifdef ENABLE_DISASSEMBLER
   // Printing
   static const char* RelocModeName(Mode rmode);
@@ skipping 662 matching lines @@
     std::vector<ConstantPoolEntry> shared_entries;
   };
 
   Label emitted_label_;  // Records pc_offset of emitted pool
   PerTypeEntryInfo info_[ConstantPoolEntry::NUMBER_OF_TYPES];
 };
 
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_ASSEMBLER_H_