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Eliminate stepping with “internal” breakpoints. We can now handle stepping in recursive functions properly. On the other hand, code does not run at full speed between step commands, since a runtime call to the debugger is necessary at each safe point. R=srdjan@google.com Review URL: https://codereview.chromium.org//149123003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@32150 260f80e4-7a28-3924-810f-c04153c831b5