[debugger] introduce abstract interface for break location.

src/x87/assembler-x87-inl.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 249 matching lines @@
   } else if (IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_)) {
     // Effectively write zero into the relocation.
     Assembler::set_target_address_at(isolate_, pc_, host_,
                                      pc_ + sizeof(int32_t));
   } else {
     UNREACHABLE();
   }
 }
 
 
-bool RelocInfo::IsPatchedReturnSequence() {
-  return *pc_ == kCallOpcode;
-}
-
-
-bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
-  return !Assembler::IsNop(pc());
-}
-
-
 void RelocInfo::Visit(Isolate* isolate, ObjectVisitor* visitor) {
   RelocInfo::Mode mode = rmode();
   if (mode == RelocInfo::EMBEDDED_OBJECT) {
     visitor->VisitEmbeddedPointer(this);
     Assembler::FlushICache(isolate, pc_, sizeof(Address));
   } else if (RelocInfo::IsCodeTarget(mode)) {
     visitor->VisitCodeTarget(this);
   } else if (mode == RelocInfo::CELL) {
     visitor->VisitCell(this);
   } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
@@ skipping 261 matching lines @@
 
 Operand::Operand(Immediate imm) {
   // [disp/r]
   set_modrm(0, ebp);
   set_dispr(imm.x_, imm.rmode_);
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_X87_ASSEMBLER_X87_INL_H_