Add support for IA-64 specific elf header flags.

Add support for IA-64 specific elf header flags.
bfd/
2000-08-14  Jim Wilson  <wilson@cygnus.com>
	* elf64-ia64.c (elf64_ia64_merge_private_bfd_data): Handle
	EF_IA_64_REDUCEDFP, EF_IA_64_CONS_GP, and EF_IA_64_NOFUNCDESC_CONS_GP.
	(elf64_ia64_print_private_bfd_data): Likewise.  Also handle
	EF_IA_64_ABSOLUTE.
gas/
2000-08-14  Jim Wilson  <wilson@cygnus.com>
	* config/tc-ia64.c (md_longopts): Add -mconstant-gp and -mauto-pic.
	(md_parse_option):  Add OPTION_MCONSTANT_GP and OPTION_MAUTO_PIC.
	(md_begin): Change assignment to md.flag to OR in the new bit.
include/elf/
2000-08-14  Jim Wilson  <wilson@cygnus.com>
	* elf/ia64.h (EF_IA_64_REDUCEDFP, EF_IA_64_CONS_GP,
	EF_IA_64_NOFUNCDESC_CONS_GP, EF_IA_64_ABSOLUTE): Define.