[PATCH] Fix PPC non-CFI + CFI unwinding (incomplete in HEAD)

[Mark Kettenis]

> Date: Sat, 20 Jan 2007 14:57:22 -0500
> From: Daniel Jacobowitz <drow@false.org>
> 
> I tried combining them myself.  Could you let me know if this patch
> still fixes your bug?

This diff seems to fix

FAIL: gdb.gdb/selftest.exp: backtrace through signal handler

on powerpc-unknown-openbsd4.0.

> 2007-01-14  Joel Brobecker  <brobecker@gnat.com>
> 	    Jan Kratochvil  <jan.kratochvil@redhat.com>
> 	    Daniel Jacobowitz  <dan@codesourcery.com>
> 
> 	* rs6000-tdep.c (bl_to_blrl_insn_p): New function.
> 	(skip_prologue): Allow bl->blrl used by PIC code.