DWARF: Use DW_OP_addrx and DW_OP_constx for DWARF5.

DWARF: Use DW_OP_addrx and DW_OP_constx for DWARF5.

For older DWARF and -gsplit-dwarf we want to emit DW_OP_GNU_addr_index
and DW_OP_GNU_const_index, but for DWARF5 we should use DW_OP_addrx
and DW_OP_constx.

gcc/ChangeLog:

	* dwarf2out.c (dwarf_OP): Handle DW_OP_addrx and DW_OP_constx.
	(size_of_loc_descr): Likewise.
	(output_loc_operands): Likewise.
	(output_loc_operands_raw): Likewise.
	(dw_addr_op): Use dwarf_OP () for DW_OP_constx and DW_OP_addrx.
	(resolve_addr_in_expr): Handle DW_OP_addrx and DW_OP_constx.
	(hash_loc_operands): Likewise.
	(compare_loc_operands): Likewise.

From-SVN: r260252