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With OSR there can be multiple loops that share one common loop header. These loops must be treated as one loop, otherwise side effects are not correctly computed. BUG=dartbug.com/16151 TEST=language/osr_test R=srdjan@google.com Review URL: https://codereview.chromium.org//144053002 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@31956 260f80e4-7a28-3924-810f-c04153c831b5