dwarf2out.c (mem_loc_descriptor): Use DW_OP_deref_size if MEM's mode size isn't DWARF...

dwarf2out.c (mem_loc_descriptor): Use DW_OP_deref_size if MEM's mode size isn't DWARF2_ADDR_SIZE.

	* dwarf2out.c (mem_loc_descriptor) <case MEM>: Use DW_OP_deref_size
	if MEM's mode size isn't DWARF2_ADDR_SIZE.
	(mem_loc_descriptor) <do_scompare>: Allow also VOIDmode arguments.
	Optimize eq/ne comparisons when both arguments are known to be
	zero-extended.
	(mem_loc_descriptor) <do_ucompare>: Allow also VOIDmode arguments.
	Don't mask operands unnecessarily if they are known to be already
	zero-extended.

From-SVN: r156692