X64: Omitted creating native builtins and using them in test-heap.

src/objects-inl.h

 // Copyright 2006-2008 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 746 matching lines @@
   ASSERT(value >> kSpaceTagSize == requested);
   ASSERT(Smi::IsValid(value));
   ASSERT(value == ((value << kFailureTypeTagSize) >> kFailureTypeTagSize));
   ASSERT(Smi::IsValid(value << kFailureTypeTagSize));
   return Construct(RETRY_AFTER_GC, value);
 }
 
 
 Failure* Failure::Construct(Type type, int value) {
   int info = (value << kFailureTypeTagSize) | type;
+  // TODO(X64): Stop using Smi validation for non-smi checks, even if they
+  // happen to be identical at the moment.
   ASSERT(Smi::IsValid(info));  // Same validation check as in Smi
   return reinterpret_cast<Failure*>(
-      static_cast<intptr_t>((info << kFailureTagSize) | kFailureTag));
+      (static_cast<intptr_t>(info) << kFailureTagSize) | kFailureTag);
 }
 
 
 bool Smi::IsValid(int value) {
 #ifdef DEBUG
   bool in_range = (value >= kMinValue) && (value <= kMaxValue);
 #endif
   // To be representable as an tagged small integer, the two
   // most-significant bits of 'value' must be either 00 or 11 due to
   // sign-extension. To check this we add 01 to the two
@@ skipping 1848 matching lines @@
 #undef WRITE_INT_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_