ARM EABI backtrace using unwind information.

ARM EABI backtrace using unwind information.

2009-06-24  Maxim Kuvyrkov  <maxim@codesourcery.com>
            Mark Mitchell  <mark@codesourcery.com>
            Joseph Myers  <joseph@codesourcery.com>
            Kazu Hirata  <kazu@codesourcery.com>

	* sysdeps/arm/eabi/backtrace.c: New.
	* sysdeps/arm/eabi/Makefile (CFLAGS-backtrace.c): Add
	-funwind-tables.
	* sysdeps/arm/preconfigure: Add -fno-unwind-tables to CFLAGS.
	* sysdeps/unix/sysv/linux/arm/eabi/configure.in: Remove
	-fno-unwind-tables from CFLAGS.
	* sysdeps/unix/sysv/linux/arm/eabi/configure: Regenerate.
	* sysdeps/unix/sysv/linux/arm/eabi/nptl/unwind.h (_Unwind_Trace_Fn):
	Define.
	(_Unwind_Backtrace): Declare.