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The Dart VM now requires at least SSE3 to build and run. There is a new flag --use-sse41 (default:true) to disable the use of SSE 4.1 features manually. Review URL: https://codereview.chromium.org//10990028 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@12897 260f80e4-7a28-3924-810f-c04153c831b5