Make Win64 compile.

src/serialize.cc

Index: src/serialize.cc
diff --git a/src/serialize.cc b/src/serialize.cc
index 78abd47b2105035a0822b0ba8aa86999c1e8fb3d..34722673371c3453a87fa7d9b72a7ca6f30c89c3 100644
--- a/src/serialize.cc
+++ b/src/serialize.cc
@@ -631,6 +631,7 @@ Address Deserializer::Allocate(int space_index, Space* space, int size) {
       maybe_new_allocation =
           reinterpret_cast<PagedSpace*>(space)->AllocateRaw(size);
     }
+    ASSERT(!maybe_new_allocation->IsFailure());
     Object* new_allocation = maybe_new_allocation->ToObjectUnchecked();
     HeapObject* new_object = HeapObject::cast(new_allocation);
     address = new_object->address();
@@ -691,6 +692,7 @@ HeapObject* Deserializer::GetAddressFromStart(int space) {
 
 void Deserializer::Deserialize() {
   isolate_ = Isolate::Current();
+  ASSERT(isolate_ != NULL);
   // Don't GC while deserializing - just expand the heap.
   Address* store_buffer_top =
       reinterpret_cast<Address*>(isolate_->heap()->store_buffer_top());