Changes by: Aleksey Nogin (nogin at metaprl.org)
Date: 2007-07-18 11:32:43 -0700 (Wed, 18 Jul 2007)
Revision: 11320
Log message:

      - Make sure that Sys.Break (and some other exceptions) are never wrapped in an
       UncaughtException
     - When the build is interrupted with Sys.Break, always report the
       exn_error_code, _except_ when this have happened during the -P polling.