Ensure that all descriptors have a valid enumeration index, and replace NextEnumIndex with LastAdde…

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 1500 matching lines @@
       break;
     case CONSTANT_FUNCTION:
       return;
     case TRANSITION: {
       Object* value = lookup->GetTransitionValue();
       // Callbacks.
       if (value->IsAccessorPair()) return;
 
       Handle<Map> transition(Map::cast(value));
       DescriptorArray* target_descriptors = transition->instance_descriptors();
-      int descriptor = target_descriptors->SearchWithCache(*name);
-      ASSERT(descriptor != DescriptorArray::kNotFound);
+      int descriptor = target_descriptors->LastAdded();
       PropertyDetails details = target_descriptors->GetDetails(descriptor);
 
       if (details.type() != FIELD || details.attributes() != NONE) return;
 
       int field_index = target_descriptors->GetFieldIndex(descriptor);
       code = isolate()->stub_cache()->ComputeStoreField(
           name, receiver, field_index, transition, strict_mode);
 
       break;
     }
@@ skipping 450 matching lines @@
       // Callbacks transition.
       if (value->IsAccessorPair()) {
         code = (strict_mode == kStrictMode)
             ? generic_stub_strict()
             : generic_stub();
         break;
       }
 
       Handle<Map> transition(Map::cast(value));
       DescriptorArray* target_descriptors = transition->instance_descriptors();
-      int descriptor = target_descriptors->SearchWithCache(*name);
-      ASSERT(descriptor != DescriptorArray::kNotFound);
+      int descriptor = target_descriptors->LastAdded();
       PropertyDetails details = target_descriptors->GetDetails(descriptor);
 
       if (details.type() == FIELD && details.attributes() == NONE) {
         int field_index = target_descriptors->GetFieldIndex(descriptor);
         code = isolate()->stub_cache()->ComputeKeyedStoreField(
             name, receiver, field_index, transition, strict_mode);
         break;
       }
       // fall through.
     }
@@ skipping 700 matching lines @@
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) {
   return IC_utilities[id];
 }
 
 
 } }  // namespace v8::internal