* dwarf2out.c (debug_line_str_section): New variable.
	(debug_line_str_hash): Likewise.
	(DEBUG_LINE_STR_SECTION): Define.
	(set_indirect_string): Handle DW_FORM_line_strp like
	DW_FORM_strp.
	(find_string_form): Fix up formatting.
	(size_of_die): Handle DW_FORM_line_strp like DW_FORM_strp.
	Fix up indentation.
	(output_die): Handle DW_FORM_line_strp.
	(DWARF5_USE_DEBUG_LINE_STR): Define.
	(output_line_string): New function.
	(output_file_names): Add -gdwarf-5 support.
	(output_line_info): Likewise.
	(init_sections_and_labels): Initialize debug_line_str_section.
	(output_indirect_string): Change 2nd argument from void *
	to enum dwarf_form form, compare with form rather than
	DW_FORM_strp.
	(output_indirect_strings): Pass DW_FORM_strp to
	output_indirect_string traversion.
	(dwarf2out_finish): Output .debug_line_str strings.
	(dwarf2out_c_finalize): Clear debug_line_str_section and
	debug_line_str_hash.

From-SVN: r241723