PATCH repeat loop break

[Timothy Wall]

This patch provides support for an implementation of a conditional break
out of an assembly repeat loop.  It also allows the repeat start/end
tokens to be named something differently for compatibility purposes.

       * gas/read.c (s_rept): Call do_repeat, which abstracts the repeat

        logic.
        (do_repeat): New.  Abstract repeat logic so that a "break" can
be
        implemented.
        (end_repeat): New.  Provide support for a "break" out of the
        repeat loop.
        * gas/read.h: Add prototypes for new functions.