CRIS port; frame cleanup crash

[Orjan Friberg <orjan dot friberg at axis dot com>]

After a long overdue update of my gdb cvs tree, I found that something 
broke late March/early April.  I don't quite understand what goes on, 
but it seems to happen the first time a frame allocated by 
deprecated_frame_xmalloc_with_cleanup is freed by do_cleanups (which 
happens in cris_skip_prologue_main).  gdb segfaults on a call to free 
with a pointer to that frame.  The arm-tdep.c file contains the same 
construct of:

  old_chain = make_cleanup (null_cleanup, NULL);
  frame = deprecated_frame_xmalloc_with_cleanup (..., ...)
  <do something with frame>
  do_cleanups (old_chain);

The only thing I found that looked suspicous was that the frame variable 
is allocated by a call to obstack_alloc, but free'd with a "normal" call 
to free.  I would have guessed it should be with obstack_free, but then 
again, my understanding of what happens is limited so far.

Any pointers or suggestions are appreciated.

--
Orjan Friberg
Axis Communications