Promoting elements transitions to their own field.

src/ic.cc

 // 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 1463 matching lines @@
           name, receiver, callback, strict_mode);
       break;
     }
     case INTERCEPTOR:
       ASSERT(!receiver->GetNamedInterceptor()->setter()->IsUndefined());
       code = isolate()->stub_cache()->ComputeStoreInterceptor(
           name, receiver, strict_mode);
       break;
     case CONSTANT_FUNCTION:
     case CONSTANT_TRANSITION:
-    case ELEMENTS_TRANSITION:
       return;
     case HANDLER:
     case NULL_DESCRIPTOR:
       UNREACHABLE();
       return;
   }
 
   // Patch the call site depending on the state of the cache.
   if (state == UNINITIALIZED || state == MONOMORPHIC_PROTOTYPE_FAILURE) {
     set_target(*code);
@@ skipping 438 matching lines @@
         code = isolate()->stub_cache()->ComputeKeyedStoreField(
             name, receiver, index, transition, strict_mode);
         break;
       }
       // fall through.
     case NORMAL:
     case CONSTANT_FUNCTION:
     case CALLBACKS:
     case INTERCEPTOR:
     case CONSTANT_TRANSITION:
-    case ELEMENTS_TRANSITION:
       // Always rewrite to the generic case so that we do not
       // repeatedly try to rewrite.
       code = (strict_mode == kStrictMode)
           ? generic_stub_strict()
           : generic_stub();
       break;
     case HANDLER:
     case NULL_DESCRIPTOR:
       UNREACHABLE();
       return;
@@ skipping 685 matching lines @@
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) {
   return IC_utilities[id];
 }
 
 
 } }  // namespace v8::internal