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Safepoints are associated with the end of instructions so that splitting a live range at a safe point position makes the safepoint at that position belong to the correct live range. Review URL: https://codereview.chromium.org//10963029 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@12708 260f80e4-7a28-3924-810f-c04153c831b5