Add Visium support to opcodes

Add Visium support to opcodes

include/
	* dis-asm.h (print_insn_visium): Declare.
include/opcode/
	* visium.h: New file.
opcodes/
	* configure.ac: Add Visium support.
	* configure: Regenerate.
	* Makefile.am (TARGET_LIBOPCODES_CFILES): Add visium-dis.c and
	visium-opc.c.
	* Makefile.in: Regenerate.
	* disassemble.c (ARCH_visium): Define if ARCH_all.
	(disassembler): Deal with bfd_arch_visium if ARCH_visium.
	* visium-dis.c: New file.
	* visium-opc.c: Likewise.
	* po/POTFILES.in: Regenerate.