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These should be used instead of single register load and store on frame entry and exit. I'll update these in another change. R=regis@google.com Review URL: https://codereview.chromium.org//630033003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@40960 260f80e4-7a28-3924-810f-c04153c831b5