Scott Wolchok e589595bc9 YGNode::getChildren() should return const ref
Summary:
It's wasteful to do it by value. I'm fairly sure this is
safe, especially because
fbd332dee8 (diff-ade2a4bbd6582e2898cbd9e0fa142ab5R215)
shows that we did access by reference before.

Reviewed By: priteshrnandgaonkar, davidaurelio

Differential Revision: D8822697

fbshipit-source-id: 791bcf0fa37453f67795af727c85c8adce3b0f69
2018-07-13 12:48:02 -07:00
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