[PATCH] bfd: harmonize and improve auxiliary entries support for XCOFF

[CHIGOT, CLEMENT]

The reading and the writing of auxialiry entries was built upon COFF
version, even if some parts don't make sense on XCOFF.
This commit reworks the swap_aux_in and swap_aux_out functions for
both XCOFF32 and XCOFF64 to match the offical documentation.
The external representation was changed but not the internal as it is
common to all COFF systems.
At the same time, add support for C_DWARF auxiliary entries.

bfd/ChangeLog:
2021-04-21  Clément Chigot  <clement.chigot@atos.net>

	* coff-rs6000.c (_bfd_xcoff_swap_aux_in): Add errors for
	unsupported storage class or auxialiry entries.
	Improve and adapt to new aux structures.
	Add C_DWARF support.
	(_bfd_xcoff_swap_aux_out): Likewise.
	* coff64-rs6000.c (_bfd_xcoff64_swap_aux_in): Likewise.
	(_bfd_xcoff64_swap_aux_out): Likewise.

binutils/ChangeLog:
2021-04-21  Clément Chigot  <clement.chigot@atos.net>

	* od-xcoff.c (dump_xcoff32_symbols): Adapt to new
	aux structures.

include/ChangeLog:
2021-04-21  Clément Chigot  <clement.chigot@atos.net>

	* coff/internal.h (union internal_auxent):
	 Add x_sect structure.
	* coff/rs6000.h (union external_auxent): Rework to
	match official documentation.
	* coff/rs6k64.h (union external_auxent): Likewise.
	(_AUX_SECT): New define.


Please apply if approved.
Thanks,

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