[debugger] introduce abstract interface for break location.

src/x87/assembler-x87-inl.h

Index: src/x87/assembler-x87-inl.h
diff --git a/src/x87/assembler-x87-inl.h b/src/x87/assembler-x87-inl.h
index 30c05c5f3e5416754ac4192e6ea95fdf6473281c..7af1d02f329f75e3f43d873d243735a462f6712b 100644
--- a/src/x87/assembler-x87-inl.h
+++ b/src/x87/assembler-x87-inl.h
@@ -267,16 +267,6 @@ void RelocInfo::WipeOut() {
 }
 
 
-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) {