Combine DEBUG_BREAK and DEBUG_PREPARE_STEP_IN into one IC stub kind DEBUG_STUB, encoding DEBUG_BREA…

src/debug.h

 // Copyright 2012 the V8 project authors. 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 61 matching lines @@
 };
 
 
 // Type of exception break. NOTE: These values are in macros.py as well.
 enum BreakLocatorType {
   ALL_BREAK_LOCATIONS = 0,
   SOURCE_BREAK_LOCATIONS = 1
 };
 
 
+enum DebugExtraICState {
+  DEBUG_BREAK,
+  DEBUG_PREPARE_STEP_IN
+};
+
+
 // Class for iterating through the break points in a function and changing
 // them.
 class BreakLocationIterator {
  public:
   explicit BreakLocationIterator(Handle<DebugInfo> debug_info,
                                  BreakLocatorType type);
   virtual ~BreakLocationIterator();
 
   void Next();
   void Next(int count);
@@ skipping 949 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(MessageDispatchHelperThread);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 #endif  // V8_DEBUG_H_