PowerPC table driven -Mraw disassembly

opcodes/
	* ppc-dis.c (lookup_powerpc): Test deprecated field when -Many.
	Don't special case PPC_OPCODE_RAW.
	(lookup_prefix): Likewise.
	(lookup_vle, lookup_spe2): Similarly.  Add dialect parameter and..
	(print_insn_powerpc): ..update caller.
	* ppc-opc.c (EXT): Define.
	(powerpc_opcodes): Mark extended mnemonics with EXT.
	(prefix_opcodes, vle_opcodes): Likewise.
	(XISEL, XISEL_MASK): Add cr field and simplify.
	(powerpc_opcodes): Use XISEL with extended isel mnemonics and sort
	all isel variants to where the base mnemonic belongs.  Sort dstt,
	dststt and dssall.
gas/
	* testsuite/gas/ppc/raw.s,
	* testsuite/gas/ppc/raw.d: New test.
	* testsuite/gas/ppc/ppc.exp: Run it.