Make Failure inherit from MaybeObject instead of Object.

src/x64/assembler-x64.cc

 // Copyright 2009 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 100 matching lines @@
   __ movq(rsp, rbp);
   __ pop(rbx);
   __ pop(rcx);
   __ popfq();
   __ pop(rbp);
   __ ret(0);
 #undef __
 
   CodeDesc desc;
   assm.GetCode(&desc);
-  Object* code = Heap::CreateCode(desc,
-                                  Code::ComputeFlags(Code::STUB),
-                                  Handle<Object>());
+  MaybeObject* maybe_code = Heap::CreateCode(desc,
+                                             Code::ComputeFlags(Code::STUB),
+                                             Handle<Object>());
+  Object* code;
+  if (!maybe_code->ToObject(&code)) return;
   if (!code->IsCode()) return;
   PROFILE(CodeCreateEvent(Logger::BUILTIN_TAG,
                           Code::cast(code), "CpuFeatures::Probe"));
   typedef uint64_t (*F0)();
   F0 probe = FUNCTION_CAST<F0>(Code::cast(code)->entry());
   supported_ = probe();
   found_by_runtime_probing_ = supported_;
   found_by_runtime_probing_ &= ~kDefaultCpuFeatures;
   uint64_t os_guarantees = OS::CpuFeaturesImpliedByPlatform();
   supported_ |= os_guarantees;
@@ skipping 2870 matching lines @@
   // specially coded on x64 means that it is a relative 32 bit address, as used
   // by branch instructions.
   return (1 << rmode_) & kApplyMask;
 }
 
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64