Remove unused StubType's, freeing 2 bits in Code objects.

src/objects.cc

 // Copyright 2013 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 11057 matching lines @@
     case DEBUG_STUB: return "DEBUG_STUB";
   }
   UNREACHABLE();
   return NULL;
 }
 
 
 const char* Code::StubType2String(StubType type) {
   switch (type) {
     case NORMAL: return "NORMAL";
-    case FIELD: return "FIELD";
-    case CONSTANT: return "CONSTANT";
-    case CALLBACKS: return "CALLBACKS";
-    case INTERCEPTOR: return "INTERCEPTOR";
-    case TRANSITION: return "TRANSITION";
-    case NONEXISTENT: return "NONEXISTENT";
+    case FAST: return "FAST";
   }
   UNREACHABLE();  // keep the compiler happy
   return NULL;
 }
 
 
 void Code::PrintExtraICState(FILE* out, Kind kind, ExtraICState extra) {
   PrintF(out, "extra_ic_state = ");
   const char* name = NULL;
   switch (kind) {
@@ skipping 5554 matching lines @@
 #define ERROR_MESSAGES_TEXTS(C, T) T,
   static const char* error_messages_[] = {
       ERROR_MESSAGES_LIST(ERROR_MESSAGES_TEXTS)
   };
 #undef ERROR_MESSAGES_TEXTS
   return error_messages_[reason];
 }
 
 
 } }  // namespace v8::internal