Oilpan: like Vector<T>, restrict Deque<T> to certain part objects.

Source/wtf/Deque.h

Index: Source/wtf/Deque.h
diff --git a/Source/wtf/Deque.h b/Source/wtf/Deque.h
index 9395d67a553d950add50f5b1fbec2085e2a09f75..89d4edc477b149a5817db4d5c84acb1aaa1cab46 100644
--- a/Source/wtf/Deque.h
+++ b/Source/wtf/Deque.h
@@ -225,6 +225,10 @@ namespace WTF {
         : m_start(0)
         , m_end(0)
     {
+        static_assert(!IsPolymorphic<T>::value || !VectorTraits<T>::canInitializeWithMemset, "Cannot initialize with memset if there is a vtable");
+#if ENABLE(OILPAN)
+        static_assert(Allocator::isGarbageCollected || !IsAllowOnlyInlineAllocation<T>::value || !NeedsTracing<T>::value, "Cannot put ALLOW_ONLY_INLINE_ALLOCATION objects that have trace methods into an off-heap Deque");
+#endif
     }
 
     template<typename T, size_t inlineCapacity, typename Allocator>