Change to breakpoint.c breaks insight on trunk

[Nick Kelsey]

Hi all,

Recently a new debug assert was added:

  /* This function is used by two files: get_frame_type(), after first
     checking that !USE_GENERIC_DUMMY_FRAMES; and sparc-tdep.c, which
     doesn't yet use generic dummy frames anyway.  */
  gdb_assert (!USE_GENERIC_DUMMY_FRAMES);

It is also used by gdbtk-cmds.c and gdbtk-stack.c - someone can't count :-)

For targets where USE_GENERIC_DUMMY_FRAMES is used, insight trips up on the
assert every time.

Nick