Power10 dcbf, sync, and wait extensions.

Power10 dcbf, sync, and wait extensions.

opcodes/
	* ppc-opc.c (insert_ls, extract_ls): Handle 3-bit L fields and new
	WC values on POWER10 sync, dcbf  and wait instructions.
	(insert_pl, extract_pl): New functions.
	(L2OPT, LS, WC): Use insert_ls and extract_ls.
	(LS3): New , 3-bit L for sync.
	(LS3, L3OPT): New, 3-bit L for sync and dcbf.
	(SC2, PL): New, 2-bit SC and PL for sync and wait.
	(XWCPL_MASK, XL3RT_MASK, XSYNCLS_MASK): New instruction masks.
	(XOPL3, XWCPL, XSYNCLS): New opcode macros.
	(powerpc_opcodes) <dcbflp, dcbfps, dcbstps pause_short, phwsync,
	plwsync, stcisync, stncisync, stsync, waitrsv>: New extended mnemonics.
	<wait>: Enable PL operand on POWER10.
	<dcbf>: Enable L3OPT operand on POWER10.
	<sync>: Enable SC2 operand on POWER10.

gas/
	* testsuite/gas/ppc/power9.s <dcbf, dcbfl, dcbflp>: Add tests.
	* testsuite/gas/ppc/power9.d: Likewise.
	* testsuite/gas/ppc/power10.s <dcbf, dcbfps, dcbstps, hwsync, lwsync,
	pause_short, phwsync, plwsync, ptesync, stcisync, stncisync, stsync,
	sync, wait, waitrsv>: Add tests.
	* testsuite/gas/ppc/power10.d: Likewise.