gas/

gas/
	* config/tc-ppc.c (md_show_usage): Document -m476.
	* doc/c-ppc.texi (PowerPC-Opts): Document -m476.

gas/testsuite/
	* gas/ppc/476.s: New test.
	* gas/ppc/476.d: Likewise.
	* gas/ppc/ppc.exp: Run the 476 test.

include/opcode/
	* ppc.h (PPC_OPCODE_476): Define.

opcodes/
	* ppc-dis.c (ppc_opts): Add "476" entry.
	* ppc-opc.c (PPC476): Define.
	(powerpc_opcodes): Update mnemonics where required for 476.