WIP: Add a dummy 8 byte to CSSValue

Source/core/css/CSSValue.h

Index: Source/core/css/CSSValue.h
diff --git a/Source/core/css/CSSValue.h b/Source/core/css/CSSValue.h
index 0a66590a57de3c01c7b92e9edc5e108b91f1cbbe..acf66c11d99a35904df2e3ff0af1fc8dea24c44b 100644
--- a/Source/core/css/CSSValue.h
+++ b/Source/core/css/CSSValue.h
@@ -44,7 +44,7 @@ public:
     static void* allocateObject(size_t size, bool isEager)
     {
         ThreadState* state = ThreadStateFor<ThreadingTrait<CSSValue>::Affinity>::state();
-        return Heap::allocateOnHeapIndex(state, size, isEager ? ThreadState::EagerSweepHeapIndex : ThreadState::CSSValueHeapIndex, GCInfoTrait<CSSValue>::index());
+        return Heap::allocateOnHeapIndex(state, size + 8, isEager ? ThreadState::EagerSweepHeapIndex : ThreadState::CSSValueHeapIndex, GCInfoTrait<CSSValue>::index());
     }
 #else
     // Override RefCounted's deref() to ensure operator delete is called on