Make IC patching resilient to flushing of the original target() ic.

src/objects.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 4262 matching lines @@
   enum StubType {
     NORMAL,
     FIELD,
     CONSTANT_FUNCTION,
     CALLBACKS,
     INTERCEPTOR,
     MAP_TRANSITION,
     NONEXISTENT
   };
 
-  enum IcFragment {
-    IC_FRAGMENT,
-    HANDLER_FRAGMENT
-  };
-
   enum {
     NUMBER_OF_KINDS = LAST_IC_KIND + 1
   };
 
   typedef int ExtraICState;
 
   static const ExtraICState kNoExtraICState = 0;
 
 #ifdef ENABLE_DISASSEMBLER
   // Printing
@@ skipping 4801 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_