Mach-O: Add BFD_MACH_O_CPU_TYPE_ARM64.

include/mach-o/
        * loader.h (bfd_mach_o_cpu_type): Add BFD_MACH_O_CPU_TYPE_ARM64.

bfd/
        * mach-o.c (bfd_mach_o_convert_architecture): Add
        BFD_MACH_O_CPU_TYPE_ARM64.

binutils/
        * od-macho.c (bfd_mach_o_cpu_name): Add BFD_MACH_O_CPU_TYPE_ARM64.
Remove VAR_DOMAIN/STRUCT_DOMAIN ambiguity from ada-tasks.c.

2014-03-26  Keith Seitz  <keiths@redhat.com>

	* ada-tasks.c (get_tcb_types_info): Search STRUCT_DOMAIN for
	types, not VAR_DOMAIN.