[debugger] introduce abstract interface for break location.

src/arm64/assembler-arm64-inl.h

Index: src/arm64/assembler-arm64-inl.h
diff --git a/src/arm64/assembler-arm64-inl.h b/src/arm64/assembler-arm64-inl.h
index 4947e138fe2cb03987f9551389cde748153029f4..aeca563c37f577b5a2582ea3605c026d6ca23704 100644
--- a/src/arm64/assembler-arm64-inl.h
+++ b/src/arm64/assembler-arm64-inl.h
@@ -853,24 +853,6 @@ void RelocInfo::WipeOut() {
 }
 
 
-bool RelocInfo::IsPatchedReturnSequence() {
-  // The sequence must be:
-  //   ldr ip0, [pc, #offset]
-  //   blr ip0
-  // See arm64/debug-arm64.cc DebugCodegen::PatchDebugBreakSlot
-  Instruction* i1 = reinterpret_cast<Instruction*>(pc_);
-  Instruction* i2 = i1->following();
-  return i1->IsLdrLiteralX() && (i1->Rt() == kIp0Code) &&
-         i2->IsBranchAndLinkToRegister() && (i2->Rn() == kIp0Code);
-}
-
-
-bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
-  Instruction* current_instr = reinterpret_cast<Instruction*>(pc_);
-  return !current_instr->IsNop(Assembler::DEBUG_BREAK_NOP);
-}
-
-
 void RelocInfo::Visit(Isolate* isolate, ObjectVisitor* visitor) {
   RelocInfo::Mode mode = rmode();
   if (mode == RelocInfo::EMBEDDED_OBJECT) {