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We compiled a.y.x += 1 into a.y.x = a.y.x + 1. Similarly foo().x++ was compiled into foo().x = foo().x + 1. Now we store the receiver and reuse it on both sides. Review URL: https://chromiumcodereview.appspot.com//9979021 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@6365 260f80e4-7a28-3924-810f-c04153c831b5