gas/testsuite/

	* gas/m68k/br-isaa.s: New.
	* gas/m68k/br-isaa.d: New.
	* gas/m68k/br-isab.s: New.
	* gas/m68k/br-isab.d: New.
	* gas/m68k/br-isac.s: New.
	* gas/m68k/br-isac.d: New.
	* gas/m68k/all.exp: Adjust.

	gas/
	* config/tc-m68k.c (mcf54455_ctrl): New.
	(HAVE_LONG_DISP, HAVE_LONG_CALL, HAVE_LONG_COND): New.
	(m68k_archs): Add isac.
	(m68k_cpus): Add 54455 family.
	(m68k_ip): Split Bg into Bb, Bs, Bg.
	(m68k_elf_final_processing): Add ISA_C.
	* doc/c-m68k.texi (M680x0 Options): Add isac.

	include/opcode/
	* m68k.h (mcfisa_c): New.
	(mcfusp, mcf_mask): Adjust.

	bfd/
	* archures.c (bfd_mach_mcf_isa_c, bfd_mach_mcf_isa_c_mac,
	bfd_mach_mcf_isa_c_emac): New.
	* elf32-m68k.c (ISAC_PLT_ENTRY_SIZE, elf_isac_plt0_entry,
	elf_isac_plt_entry, elf_isac_plt_info): New.
	(elf32_m68k_object_p): Add ISA_C.
	(elf32_m68k_print_private_bfd_data): Print ISA_C.
	(elf32_m68k_get_plt_info): Detect ISA_C.
	* cpu-m68k.c (arch_info): Add ISAC.
	(m68k_arch_features): Likewise,
	(bfd_m68k_compatible): ISAs B & C are not compatible.

	opcodes/
	* m68k-opc.c: Mark mcfisa_c instructions.