gas/

gas/
	* config/tc-ppc.c (md_show_usage): Document -mpcca2.
	* doc/c-ppc.texi (PowerPC-Opts): Document -mppca2.

gas/testsuite/
	* gas/ppc/a2.s: New.
	* gas/ppc/a2.d: Likewise.
	* gas/ppc/ppc.exp: Run the a2 dump test.

include/opcode/
	* ppc.h (PPC_OPCODE_PPCA2): New.

opcodes/
	* ppc-dis.c (ppc_opts): Add "ppca2" entry.
	* ppc-opc.c (powerpc_opcodes): Add eratilx, eratsx, eratsx.,
	eratre, wchkall, eratwe, ldawx., mdfcrx., mfdcr. mtdcrx., icswx,
	icswx., mtdcr., dci, wclrone, wclrall, wclr, erativax, tlbsrx.,
	ici mnemonics.
	(ERAT_T): New operand.
	(XWC_MASK): New mask.
	(XOPL2): New macro.
	(PPCA2): Define.