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We can cause _l, _m and _h to be inferred by dart2js as a non-negative 31-bit int which leads to better code for shifts. R=floitsch@google.com Review URL: https://codereview.chromium.org//404453002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@38680 260f80e4-7a28-3924-810f-c04153c831b5