Make Failure inherit from MaybeObject instead of Object.

src/serialize.cc

Index: src/serialize.cc
===================================================================
--- src/serialize.cc	(revision 5696)
+++ src/serialize.cc	(working copy)
@@ -555,14 +555,16 @@
   if (!SpaceIsLarge(space_index)) {
     ASSERT(!SpaceIsPaged(space_index) ||
            size <= Page::kPageSize - Page::kObjectStartOffset);
-    Object* new_allocation;
+    MaybeObject* maybe_new_allocation;
     if (space_index == NEW_SPACE) {
-      new_allocation = reinterpret_cast<NewSpace*>(space)->AllocateRaw(size);
+      maybe_new_allocation =
+          reinterpret_cast<NewSpace*>(space)->AllocateRaw(size);
     } else {
-      new_allocation = reinterpret_cast<PagedSpace*>(space)->AllocateRaw(size);
+      maybe_new_allocation =
+          reinterpret_cast<PagedSpace*>(space)->AllocateRaw(size);
     }
+    Object* new_allocation = maybe_new_allocation->ToObjectUnchecked();
     HeapObject* new_object = HeapObject::cast(new_allocation);
-    ASSERT(!new_object->IsFailure());
     address = new_object->address();
     high_water_[space_index] = address + size;
   } else {
@@ -571,14 +573,14 @@
     LargeObjectSpace* lo_space = reinterpret_cast<LargeObjectSpace*>(space);
     Object* new_allocation;
     if (space_index == kLargeData) {
-      new_allocation = lo_space->AllocateRaw(size);
+      new_allocation = lo_space->AllocateRaw(size)->ToObjectUnchecked();
     } else if (space_index == kLargeFixedArray) {
-      new_allocation = lo_space->AllocateRawFixedArray(size);
+      new_allocation =
+          lo_space->AllocateRawFixedArray(size)->ToObjectUnchecked();
     } else {
       ASSERT_EQ(kLargeCode, space_index);
-      new_allocation = lo_space->AllocateRawCode(size);
+      new_allocation = lo_space->AllocateRawCode(size)->ToObjectUnchecked();
     }
-    ASSERT(!new_allocation->IsFailure());
     HeapObject* new_object = HeapObject::cast(new_allocation);
     // Record all large objects in the same space.
     address = new_object->address();