[debugger] introduce abstract interface for break location.

src/assembler.cc

 // 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 753 matching lines @@
   last_position_ = 0;
   code_age_sequence_ = NULL;
   if (mode_mask_ == 0) pos_ = end_;
   next();
 }
 
 
 // -----------------------------------------------------------------------------
 // Implementation of RelocInfo
 
+bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
+  return DebugCodegen::DebugBreakSlotIsPatched(pc_);
+}
 
 #ifdef DEBUG
 bool RelocInfo::RequiresRelocation(const CodeDesc& desc) {
   // Ensure there are no code targets or embedded objects present in the
   // deoptimization entries, they would require relocation after code
   // generation.
   int mode_mask = RelocInfo::kCodeTargetMask |
                   RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT) |
                   RelocInfo::ModeMask(RelocInfo::CELL) |
                   RelocInfo::kApplyMask;
@@ skipping 1149 matching lines @@
 
 
 void Assembler::DataAlign(int m) {
   DCHECK(m >= 2 && base::bits::IsPowerOfTwo32(m));
   while ((pc_offset() & (m - 1)) != 0) {
     db(0);
   }
 }
 }  // namespace internal
 }  // namespace v8