Oilpan: Decrease sizeof(Node) by 8 byte

Source/core/dom/Node.h

Index: Source/core/dom/Node.h
diff --git a/Source/core/dom/Node.h b/Source/core/dom/Node.h
index dc0b0f822e42ab36d19932514ce099a62915f44f..12e86142295fef1993c0eff9c131e6c1288e32c5 100644
--- a/Source/core/dom/Node.h
+++ b/Source/core/dom/Node.h
@@ -101,6 +101,12 @@ enum StyleChangeType {
     NeedsReattachStyleChange = 3 << nodeStyleChangeShift,
 };
 
+#if ENABLE(OILPAN) && USE_4BYTE_HEADER_PADDING
+#define NODE_FLAGS reinterpret_cast<HeapObjectHeader*>(reinterpret_cast<uint8_t*>(static_cast<EventTarget*>(const_cast<Node*>(this))) - sizeof(HeapObjectHeader))->m_padding
+#else
+#define NODE_FLAGS m_nodeFlags
+#endif
+
 class NodeRareDataBase {
 public:
     LayoutObject* layoutObject() const { return m_layoutObject; }
@@ -354,7 +360,7 @@ public:
 
     bool needsAttach() const { return styleChangeType() == NeedsReattachStyleChange; }
     bool needsStyleRecalc() const { return styleChangeType() != NoStyleChange; }
-    StyleChangeType styleChangeType() const { return static_cast<StyleChangeType>(m_nodeFlags & StyleChangeMask); }
+    StyleChangeType styleChangeType() const { return static_cast<StyleChangeType>(NODE_FLAGS & StyleChangeMask); }
     bool childNeedsStyleRecalc() const { return getFlag(ChildNeedsStyleRecalcFlag); }
     bool isLink() const { return getFlag(IsLinkFlag); }
     bool isEditingText() const { ASSERT(isTextNode()); return getFlag(HasNameOrIsEditingTextFlag); }
@@ -725,10 +731,10 @@ private:
 
     // 3 bits remaining.
 
-    bool getFlag(NodeFlags mask) const { return m_nodeFlags & mask; }
-    void setFlag(bool f, NodeFlags mask) { m_nodeFlags = (m_nodeFlags & ~mask) | (-(int32_t)f & mask); }
-    void setFlag(NodeFlags mask) { m_nodeFlags |= mask; }
-    void clearFlag(NodeFlags mask) { m_nodeFlags &= ~mask; }
+    bool getFlag(NodeFlags mask) const { return NODE_FLAGS & mask; }
+    void setFlag(bool f, NodeFlags mask) { NODE_FLAGS = (NODE_FLAGS & ~mask) | (-(int32_t)f & mask); }
+    void setFlag(NodeFlags mask) { NODE_FLAGS |= mask; }
+    void clearFlag(NodeFlags mask) { NODE_FLAGS &= ~mask; }
 
 protected:
     enum ConstructionType {
@@ -810,7 +816,9 @@ private:
     WillBeHeapVector<OwnPtrWillBeMember<MutationObserverRegistration>>* mutationObserverRegistry();
     WillBeHeapHashSet<RawPtrWillBeMember<MutationObserverRegistration>>* transientMutationObserverRegistry();
 
+#if !(ENABLE(OILPAN) && USE_4BYTE_HEADER_PADDING)
     uint32_t m_nodeFlags;
+#endif
     RawPtrWillBeMember<ContainerNode> m_parentOrShadowHostNode;
     RawPtrWillBeMember<TreeScope> m_treeScope;
     RawPtrWillBeMember<Node> m_previous;