re PR debug/49567 (ICE in mem_loc_descriptor due to typed DWARF stack changes)

	PR debug/49567
	* dwarf2out.c (mem_loc_descriptor) <case ZERO_EXTEND>: Give up
	for non-MODE_INT modes instead of asserting the mode has MODE_INT
	class.

	* gcc.target/i386/pr49567.c: New test.

From-SVN: r175622