Pass some constructor argumetns by const-reference

Summary: These don't need to be copied twice.

Reviewed By: priteshrnandgaonkar

Differential Revision: D7291363

fbshipit-source-id: 22e606d0b3fa1133d7e0334c8cf9f5f1f32fe64b

yoga/YGNode.cpp

@@ -423,10 +423,10 @@ YGNode::YGNode(
     YGBaselineFunc baseline,
     YGDirtiedFunc dirtied,
     YGStyle style,
-    YGLayout layout,
+    const YGLayout& layout,
     uint32_t lineIndex,
     YGNodeRef parent,
-    YGVector children,
+    const YGVector& children,
     YGNodeRef nextChild,
     YGConfigRef config,
     bool isDirty,

yoga/YGNode.h

@@ -47,10 +47,10 @@ struct YGNode {
       YGBaselineFunc baseline,
       YGDirtiedFunc dirtied,
       YGStyle style,
-      YGLayout layout,
+      const YGLayout& layout,
       uint32_t lineIndex,
       YGNodeRef parent,
-      YGVector children,
+      const YGVector& children,
       YGNodeRef nextChild,
       YGConfigRef config,
       bool isDirty,