Debugger: record reloc info for debug break slot immediate before the slot.

src/debug.h

 // 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.
 
 #ifndef V8_DEBUG_H_
 #define V8_DEBUG_H_
 
 #include "src/allocation.h"
 #include "src/arguments.h"
 #include "src/assembler.h"
@@ skipping 773 matching lines @@
  private:
   Debug* debug_;
   bool old_state_;
   DISALLOW_COPY_AND_ASSIGN(SuppressDebug);
 };
 
 
 // Code generator routines.
 class DebugCodegen : public AllStatic {
  public:
-  static void GenerateSlot(MacroAssembler* masm);
+  enum SlotLocation {
+    PLAIN_DEBUG_BREAK,
+    DEBUG_BREAK_AT_CALL,
+    DEBUG_BREAK_AT_CONSTRUCT_CALL
+  };
+
+  static void GenerateSlot(MacroAssembler* masm, SlotLocation location,
+                           int call_argc = -1);
   static void GenerateReturnDebugBreak(MacroAssembler* masm);
   static void GenerateSlotDebugBreak(MacroAssembler* masm);
   static void GeneratePlainReturnLiveEdit(MacroAssembler* masm);
 
   // FrameDropper is a code replacement for a JavaScript frame with possibly
   // several frames above.
   // There is no calling conventions here, because it never actually gets
   // called, it only gets returned to.
   static void GenerateFrameDropperLiveEdit(MacroAssembler* masm);
+
+ private:
+  static void RecordRelocInfo(MacroAssembler* masm, SlotLocation location,
+                              int call_argc);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_DEBUG_H_