2011-05-09  H.J. Lu  <hongjiu.lu@intel.com>

	PR debug/48853
	* dwarf2out.c (mem_loc_descriptor) <case SUBREG>: If
	POINTERS_EXTEND_UNSIGNED is defined, don't give up if mode is
	Pmode and mem_mode is not VOIDmode.

From-SVN: r173587