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

src/v8globals.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 245 matching lines @@
   // Has been executed but monomorhic state has been delayed.
   PREMONOMORPHIC,
   // Has been executed and only one receiver type has been seen.
   MONOMORPHIC,
   // Like MONOMORPHIC but check failed due to prototype.
   MONOMORPHIC_PROTOTYPE_FAILURE,
   // Multiple receiver types have been seen.
   POLYMORPHIC,
   // Many receiver types have been seen.
   MEGAMORPHIC,
-  // Special states for debug break or step in prepare stubs.
-  DEBUG_BREAK,
-  DEBUG_PREPARE_STEP_IN
+  // Special state for debug break or step in prepare stubs.
+  DEBUG_STUB
 };
 
 
 enum CheckType {
   RECEIVER_MAP_CHECK,
   STRING_CHECK,
   NUMBER_CHECK,
   BOOLEAN_CHECK
 };
 
@@ skipping 285 matching lines @@
 
 enum ClearExceptionFlag {
   KEEP_EXCEPTION,
   CLEAR_EXCEPTION
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_V8GLOBALS_H_