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Convert (a & 2^n) == 2^n into TestSmi instruction. R=fschneider@google.com BUG= Review URL: https://codereview.chromium.org//943273004 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@43957 260f80e4-7a28-3924-810f-c04153c831b5