CTF/BTF debug formats

This commit introduces support for generating CTF debugging
information and BTF debugging information from GCC.

2021-06-28  Indu Bhagat  <indu.bhagat@oracle.com>
	    David Faust  <david.faust@oracle.com>
	    Jose E. Marchesi  <jose.marchesi@oracle.com>
	    Weimin Pan  <weimin.pan@oracle.com>

gcc/

	* Makefile.in: Add ctfc.*, ctfout.c and btfout.c files to
	GTFILES.  Add new object files.
	* common.opt: Add CTF and BTF debug info options.
	* btfout.c: New file.
	* ctfc.c: Likewise.
	* ctfc.h: Likewise.
	* ctfout.c: Likewise.
	* dwarf2ctf.c: Likewise.
	* dwarf2ctf.h: Likewise.
	* dwarf2cfi.c (dwarf2out_do_frame): Acknowledge CTF_DEBUG and
	BTF_DEBUG.
	* dwarf2out.c (dwarf2out_source_line): Likewise.
	(dwarf2out_finish): Skip emitting DWARF if CTF or BTF are to
	be generated.
	(debug_format_do_cu): New function.
	(dwarf2out_early_finish): Traverse DIEs and emit CTF/BTF for
	them if	requested.
	Include dwarf2ctf.c.
	* final.c (dwarf2_debug_info_emitted_p): Acknowledge DWARF-based debug
	formats.
	* flag-types.h (enum debug_info_type): Add CTF_DEBUG and BTF_DEBUG.
	(CTF_DEBUG): New bitmask.
	(BTF_DEBUG): Likewise.
	(enum ctf_debug_info_levels): New enum.
	* gengtype.c (open_base_files): Handle ctfc.h.
	(main): Handle uint32_t type.
	* flags.h (btf_debuginfo_p): New definition.
	(dwarf_based_debuginfo_p): Likewise.
	* opts.c (debug_type_names): Add entries for CTF and BTF.
	(btf_debuginfo_p): New function.
	(dwarf_based_debuginfo_p): Likewise.
	(common_handle_option): Handle -gctfN and -gbtf options.
	(set_debug_level): Set CTF_DEBUG, BTF_DEBUG whenever appropriate.
	* toplev.c (process_options): Inform the user and ignore -gctfLEVEL if
	frontend is not C.

include/

	* ctf.h: New file.
	* btf.h: Likewise.

libiberty/

	* simple-object.c (handle_lto_debug_sections): Copy over .ctf
	sections.

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