Exclude logging functionality outside debug builds

Summary: Don't compile in YGNodePrint in production builds

Reviewed By: davidaurelio

Differential Revision: D14258269

fbshipit-source-id: 15b5e94d241a752fea74a45263aa343265071451

yoga/YGNodePrint.cpp

@@ -4,6 +4,7 @@
  * This source code is licensed under the MIT license found in the LICENSE
  * file in the root directory of this source tree.
  */
+#ifdef DEBUG
 #include "YGNodePrint.h"
 #include <stdarg.h>
 #include "YGEnums.h"
@@ -230,3 +231,4 @@ void YGNodeToString(
 }
 } // namespace yoga
 } // namespace facebook
+#endif