* dwarf2out.c (dwarf_tag_name): Handle DW_TAG_rvalue_reference_type
	and DW_TAG_template_alias.
	(dwarf_attr_name): Handle DW_AT_main_subprogram,
	DW_AT_data_bit_offset, DW_AT_const_expr, DW_AT_enum_class,
	DW_AT_linkage_name, DW_AT_GNU_guarded_by, DW_AT_GNU_pt_guarded_by,
	DW_AT_GNU_guarded, DW_AT_GNU_pt_guarded, DW_AT_GNU_locks_excluded,
	DW_AT_GNU_exclusive_locks_required, DW_AT_GNU_shared_locks_required
	and DW_AT_GNU_odr_signature.
	(dwarf_form_name): Handle DW_FORM_sec_offset, DW_FORM_exprloc,
	DW_FORM_flag_present and DW_FORM_ref_sig8.
	(output_signature): Only print name on the first byte.
	(output_die): Likewise for dw_val_class_data8.

	* include/dwarf2.h (DW_LANG_Python): Add comment that it is
	a DWARF 4 addition.

From-SVN: r152853