Add assertion to UniqueValueId constructor.

src/hydrogen-instructions.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 3437 matching lines @@
   int32_t dominator_size =
       HConstant::cast(dominating_allocate_->size())->GetInteger32Constant();
   HInstruction* free_space_instr =
       HInnerAllocatedObject::New(zone, context(), dominating_allocate_,
       dominator_size, type());
   free_space_instr->InsertBefore(this);
   HConstant* filler_map = HConstant::New(
       zone,
       context(),
       isolate()->factory()->free_space_map(),
-      UniqueValueId(isolate()->heap()->free_space_map()));
+      UniqueValueId::free_space_map(isolate()->heap()));
   filler_map->InsertAfter(free_space_instr);
   HInstruction* store_map = HStoreNamedField::New(zone, context(),
       free_space_instr, HObjectAccess::ForMap(), filler_map);
   store_map->SetFlag(HValue::kHasNoObservableSideEffects);
   store_map->InsertAfter(filler_map);
 
   // We must explicitly force Smi representation here because on x64 we
   // would otherwise automatically choose int32, but the actual store
   // requires a Smi-tagged value.
   HConstant* filler_size = HConstant::CreateAndInsertAfter(
@@ skipping 769 matching lines @@
       break;
     case kExternalMemory:
       stream->Add("[external-memory]");
       break;
   }
 
   stream->Add("@%d", offset());
 }
 
 } }  // namespace v8::internal