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commit	946f32503b6d17112981c49e68c6f40fd4349b42
author	Nat Mote <nmote@fb.com>
	Fri, 21 Apr 2017 22:07:07 +0000 (21 15:07 -0700)
committer	Hhvm Bot <hhvm-bot@users.noreply.github.com>
	Fri, 21 Apr 2017 22:14:29 +0000 (21 15:14 -0700)
tree	2b174327a7f96ca07b216d6497b1506cbaf2afab	tree \| snapshot (tar.gz zip)
parent	17dc2ec783f7331da754494a34849da0450ea182	commit \| diff

Use built-in union to implement MyMap.union

Reviewed By: gabelevi

Differential Revision: D4925809

fbshipit-source-id: b833187a3d628fabc5e674523794e9ceb86307ff