Debugger: use debug break slots to break at function exit.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 8e5168db1c841f08a9a050febd4c6ccc7db5715a..3ddf9ab227d56d20ae00f114dd7afe7328a6f1c0 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -10573,8 +10573,6 @@ class DebugInfo: public Struct {
  public:
   // The shared function info for the source being debugged.
   DECL_ACCESSORS(shared, SharedFunctionInfo)
-  // Code object for the original code.
-  DECL_ACCESSORS(original_code, Code)
   // Code object for the patched code. This code object is the code object
   // currently active for the function.
   DECL_ACCESSORS(code, Code)
@@ -10608,12 +10606,8 @@ class DebugInfo: public Struct {
   DECLARE_VERIFIER(DebugInfo)
 
   static const int kSharedFunctionInfoIndex = Struct::kHeaderSize;
-  static const int kOriginalCodeIndex = kSharedFunctionInfoIndex + kPointerSize;
-  static const int kPatchedCodeIndex = kOriginalCodeIndex + kPointerSize;
-  static const int kActiveBreakPointsCountIndex =
-      kPatchedCodeIndex + kPointerSize;
-  static const int kBreakPointsStateIndex =
-      kActiveBreakPointsCountIndex + kPointerSize;
+  static const int kCodeIndex = kSharedFunctionInfoIndex + kPointerSize;
+  static const int kBreakPointsStateIndex = kCodeIndex + kPointerSize;
   static const int kSize = kBreakPointsStateIndex + kPointerSize;
 
   static const int kEstimatedNofBreakPointsInFunction = 16;