Avoid the hash table StyleInvalidator::clearInvalidation in Node::detach when possible

Source/core/css/invalidation/StyleInvalidator.cpp

Index: Source/core/css/invalidation/StyleInvalidator.cpp
diff --git a/Source/core/css/invalidation/StyleInvalidator.cpp b/Source/core/css/invalidation/StyleInvalidator.cpp
index cd53db244ef75f468a674bab7496a822d8228e87..d62df05eb8dc6f4fbdf27930a6d4c9d19f047957 100644
--- a/Source/core/css/invalidation/StyleInvalidator.cpp
+++ b/Source/core/css/invalidation/StyleInvalidator.cpp
@@ -41,10 +41,10 @@ StyleInvalidator::InvalidationList& StyleInvalidator::ensurePendingInvalidationL
 
 void StyleInvalidator::clearInvalidation(Node& node)
 {
+    if (node.isElementNode() && node.needsStyleInvalidation())
+        m_pendingInvalidationMap.remove(toElement(&node));
     node.clearChildNeedsStyleInvalidation();
     node.clearNeedsStyleInvalidation();
-    if (node.isElementNode())
-        m_pendingInvalidationMap.remove(toElement(&node));
 }
 
 void StyleInvalidator::clearPendingInvalidations()