Optimize for horizontal writing mode

Source/core/rendering/RenderInline.cpp

Index: Source/core/rendering/RenderInline.cpp
diff --git a/Source/core/rendering/RenderInline.cpp b/Source/core/rendering/RenderInline.cpp
index 96e72979c8477d40e87f3de1a967e3986e9f6e8a..d156b0b6a073128e62648eef28c4461f2a99b5ec 100644
--- a/Source/core/rendering/RenderInline.cpp
+++ b/Source/core/rendering/RenderInline.cpp
@@ -1128,7 +1128,7 @@ LayoutSize RenderInline::offsetFromContainer(const RenderObject* container, cons
 
     if (offsetDependsOnPoint) {
         *offsetDependsOnPoint = container->hasColumns()
-            || (container->isBox() && container->style()->isFlippedBlocksWritingMode())
+            || (container->isBox() && container->style()->slowIsFlippedBlocksWritingMode())
             || container->isRenderFlowThread();
     }
 
@@ -1154,7 +1154,7 @@ void RenderInline::mapLocalToContainer(const RenderLayerModelObject* paintInvali
         return;
 
     if (mode & ApplyContainerFlip && o->isBox()) {
-        if (o->style()->isFlippedBlocksWritingMode()) {
+        if (o->style()->slowIsFlippedBlocksWritingMode()) {
             IntPoint centerPoint = roundedIntPoint(transformState.mappedPoint());
             transformState.move(toRenderBox(o)->flipForWritingModeIncludingColumns(centerPoint) - centerPoint);
         }