[rfc/rfa:breakpoint] Use a ``frame_id'' to track frames

[David S. Miller]

   From: Andrew Cagney <ac131313@cygnus.com>
   Date: Sun, 21 Apr 2002 19:30:16 -0400
   
   Can anyone come up with a testcase that 
   demonstrates the need for the PC comparison test?

There are various forms of trampolines (such as calling via PLT) that
would require such a check, but those need to be handled by the
target in other ways (e.g. with SOLIB_SKIP_TRAMPOLINE and friends).