[debugger] introduce abstract interface for break location.

src/objects-debug.cc

 // Copyright 2012 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.
 
 #include "src/objects.h"
 
 #include "src/bootstrapper.h"
 #include "src/disasm.h"
 #include "src/disassembler.h"
 #include "src/macro-assembler.h"
@@ skipping 1003 matching lines @@
         CHECK(e->IsUndefined());
       }
     }
   }
 }
 
 
 void DebugInfo::DebugInfoVerify() {
   CHECK(IsDebugInfo());
   VerifyPointer(shared());
-  VerifyPointer(code());
+  VerifyPointer(abstract_code());
   VerifyPointer(break_points());
 }
 
 
 void BreakPointInfo::BreakPointInfoVerify() {
   CHECK(IsBreakPointInfo());
   VerifyPointer(break_point_objects());
 }
 #endif  // VERIFY_HEAP
 
@@ skipping 284 matching lines @@
 
   // Both are done at the same time.
   CHECK_EQ(new_it.done(), old_it.done());
 }
 
 
 #endif  // DEBUG
 
 }  // namespace internal
 }  // namespace v8