Make Failure inherit from MaybeObject instead of Object.

src/code-stubs.cc

Index: src/code-stubs.cc
===================================================================
--- src/code-stubs.cc	(revision 5696)
+++ src/code-stubs.cc	(working copy)
@@ -123,7 +123,7 @@
 }
 
 
-Object* CodeStub::TryGetCode() {
+MaybeObject* CodeStub::TryGetCode() {
   Code* code;
   if (!FindCodeInCache(&code)) {
     // Generate the new code.
@@ -139,8 +139,11 @@
         static_cast<Code::Kind>(GetCodeKind()),
         InLoop(),
         GetICState());
-    Object* new_object = Heap::CreateCode(desc, flags, masm.CodeObject());
-    if (new_object->IsFailure()) return new_object;
+    Object* new_object;
+    { MaybeObject* maybe_new_object =
+          Heap::CreateCode(desc, flags, masm.CodeObject());
+      if (!maybe_new_object->ToObject(&new_object)) return maybe_new_object;
+    }
     code = Code::cast(new_object);
     RecordCodeGeneration(code, &masm);
 
@@ -148,8 +151,9 @@
       SetCustomCache(code);
     } else {
       // Try to update the code cache but do not fail if unable.
-      new_object = Heap::code_stubs()->AtNumberPut(GetKey(), code);
-      if (!new_object->IsFailure()) {
+      MaybeObject* maybe_new_object =
+          Heap::code_stubs()->AtNumberPut(GetKey(), code);
+      if (maybe_new_object->ToObject(&new_object)) {
         Heap::public_set_code_stubs(NumberDictionary::cast(new_object));
       }
     }