[PR63238] output alignment debug information

[PR63238] output alignment debug information

Output DWARFv5+ DW_AT_alignment for non-default alignment of
variables, fields and types.

for gcc/ChangeLog

	PR debug/63238
	* dwarf2out.c (clone_as_declaration): Drop DW_AT_alignment.
	(add_alignment_attribute): New.
	(base_type_die): Add alignment attribute.
	(subrange_type_die): Likewise.
	(modified_type_die): Likewise.
	(gen_array_type_die): Likewise.
	(gen_descr_array_type_die: Likewise.
	(gen_enumeration_type_die): Likewise.
	(gen_subprogram_die): Likewise.
	(gen_variable_die): Likewise.
	(gen_field_die): Likewise.
	(gen_ptr_to_mbr_type_die): Likewise.
	(gen_struct_or_union_type_die): Likewise.
	(gen_subroutine_type_die): Likewise.
	(gen_typedef_die): Likewise.
	(base_type_cmp): Compare alignment attribute.

for gcc/testsuite/ChangeLog

	PR debug/63238
	* gcc.dg/debug/dwarf2/align-1.c: New.
	* gcc.dg/debug/dwarf2/align-2.c: New.
	* gcc.dg/debug/dwarf2/align-3.c: New.
	* gcc.dg/debug/dwarf2/align-4.c: New.
	* gcc.dg/debug/dwarf2/align-5.c: New.
	* gcc.dg/debug/dwarf2/align-6.c: New.
	* gcc.dg/debug/dwarf2/align-as-1.c: New.
	* g++.dg/debug/dwarf2/align-1.C: New.
	* g++.dg/debug/dwarf2/align-2.C: New.
	* g++.dg/debug/dwarf2/align-3.C: New.
	* g++.dg/debug/dwarf2/align-4.C: New.
	* g++.dg/debug/dwarf2/align-5.C: New.
	* g++.dg/debug/dwarf2/align-6.C: New.

From-SVN: r245052