Add Linux/x32 support to Ada

2012-03-03  H.J. Lu  <hongjiu.lu@intel.com>

	* init.c (__gnat_adjust_context_for_raise): Also check
	"orq $0x0,(%esp)" for x32.

	* link.c (__gnat_default_libgcc_subdir): set to libx32 for x32.

	* gcc-interface/Makefile.in (arch): Set to x32 if MULTISUBDIR
	is /x32.
	Support x32.

From-SVN: r184859