Introduce -fno-debug-types-section flag.
* common.opt (fdebug-types-section): New flag. * doc/invoke.texi: Document new -fno-debug-types-section flag. * dwarf2out.c (use_debug_types): New define. (struct die_struct): Mark die_id with GTY desc use_debug_types. (print_die): Guard output of type unit signatures using use_debug_types. (build_abbrev_table): Replace assert of dwarf_version >= 4 with assert on use_debug_types. (size_of_die): Likewise. (unmark_dies): Likewise. (value_format): Decide AT_ref_external form on use_debug_types. (output_die): Replace dwarf_version version check guard with use_debug_types where appropriate. (modified_type_die): Likewise. (gen_reference_type_die): Likewise. (dwarf2out_start_source_file): Likewise. (dwarf2out_end_source_file): Likewise. (prune_unused_types_walk_attribs): Likewise. (dwarf2out_finish): Likewise. From-SVN: r171742
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