Make Failure inherit from MaybeObject instead of Object.

src/globals.h

 // Copyright 2006-2009 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 306 matching lines @@
 class LargeObjectSpace;
 template <typename T, class P = FreeStoreAllocationPolicy> class List;
 class LookupResult;
 class MacroAssembler;
 class Map;
 class MapSpace;
 class MarkCompactCollector;
 class NewSpace;
 class NodeVisitor;
 class Object;
+class MaybeObject;
 class OldSpace;
 class Property;
 class Proxy;
 class RegExpNode;
 struct RegExpCompileData;
 class RegExpTree;
 class RegExpCompiler;
 class RegExpVisitor;
 class Scope;
 template<class Allocator = FreeStoreAllocationPolicy> class ScopeInfo;
@@ skipping 198 matching lines @@
     unsigned int sign     :1;
     unsigned int exp      :11;
     unsigned int man_high :20;
     unsigned int man_low  :32;
   } bits;
 };
 
 
 // AccessorCallback
 struct AccessorDescriptor {
-  Object* (*getter)(Object* object, void* data);
-  Object* (*setter)(JSObject* object, Object* value, void* data);
+  MaybeObject* (*getter)(Object* object, void* data);
+  MaybeObject* (*setter)(JSObject* object, Object* value, void* data);
   void* data;
 };
 
 
 // Logging and profiling.
 // A StateTag represents a possible state of the VM.  When compiled with
 // ENABLE_VMSTATE_TRACKING, the logger maintains a stack of these.
 // Creating a VMState object enters a state by pushing on the stack, and
 // destroying a VMState object leaves a state by popping the current state
 // from the stack.
@@ skipping 151 matching lines @@
                   CMOV = 15,   // x86
                   RDTSC = 4,   // x86
                   CPUID = 10,  // x86
                   VFP3 = 1,    // ARM
                   ARMv7 = 2,   // ARM
                   SAHF = 0};   // x86
 
 } }  // namespace v8::internal
 
 #endif  // V8_GLOBALS_H_