Enable Intel VPCLMULQDQ instruction.

Enable Intel VPCLMULQDQ instruction.

Intel has disclosed a set of new instructions. The spec is
https://software.intel.com/sites/default/files/managed/c5/15/architecture-instruction-set-extensions-programming-reference.pdf

gas/

	* config/tc-i386.c (cpu_arch): Add VPCLMULQDQ.
	* doc/c-i386.texi: Document VPCLMULQDQ.
	* testsuite/gas/i386/i386.exp: Run VPCLMULQDQ tests.
	* testsuite/gas/i386/avx512f_vpclmulqdq-intel.d: New test.
	* testsuite/gas/i386/avx512f_vpclmulqdq-wig.s: Ditto.
	* testsuite/gas/i386/avx512f_vpclmulqdq-wig1-intel.d: Ditto.
	* testsuite/gas/i386/avx512f_vpclmulqdq-wig1.d: Ditto.
	* testsuite/gas/i386/avx512f_vpclmulqdq.d: Ditto.
	* testsuite/gas/i386/avx512f_vpclmulqdq.s: Ditto.
	* testsuite/gas/i386/avx512vl_vpclmulqdq-intel.d: Ditto.
	* testsuite/gas/i386/avx512vl_vpclmulqdq-wig.s: Ditto.
	* testsuite/gas/i386/avx512vl_vpclmulqdq-wig1-intel.d: Ditto.
	* testsuite/gas/i386/avx512vl_vpclmulqdq-wig1.d: Ditto.
	* testsuite/gas/i386/avx512vl_vpclmulqdq.d: Ditto.
	* testsuite/gas/i386/avx512vl_vpclmulqdq.s: Ditto.
	* testsuite/gas/i386/vpclmulqdq-intel.d: Ditto.
	* testsuite/gas/i386/vpclmulqdq.d: Ditto.
	* testsuite/gas/i386/vpclmulqdq.s: Ditto.
	* testsuite/gas/i386/x86-64-avx512f_vpclmulqdq-intel.d: Ditto.
	* testsuite/gas/i386/x86-64-avx512f_vpclmulqdq-wig.s: Ditto.
	* testsuite/gas/i386/x86-64-avx512f_vpclmulqdq-wig1-intel.d: Ditto.
	* testsuite/gas/i386/x86-64-avx512f_vpclmulqdq-wig1.d: Ditto.
	* testsuite/gas/i386/x86-64-avx512f_vpclmulqdq.d: Ditto.
	* testsuite/gas/i386/x86-64-avx512f_vpclmulqdq.s: Ditto.
	* testsuite/gas/i386/x86-64-avx512vl_vpclmulqdq-intel.d: Ditto.
	* testsuite/gas/i386/x86-64-avx512vl_vpclmulqdq-wig.s: Ditto.
	* testsuite/gas/i386/x86-64-avx512vl_vpclmulqdq-wig1-intel.d: Ditto.
	* testsuite/gas/i386/x86-64-avx512vl_vpclmulqdq-wig1.d: Ditto.
	* testsuite/gas/i386/x86-64-avx512vl_vpclmulqdq.d: Ditto.
	* testsuite/gas/i386/x86-64-avx512vl_vpclmulqdq.s: Ditto.
	* testsuite/gas/i386/x86-64-vpclmulqdq-intel.d: Ditto.
	* testsuite/gas/i386/x86-64-vpclmulqdq.d: Ditto.
	* testsuite/gas/i386/x86-64-vpclmulqdq.s: Ditto.

opcodes/

	* i386-dis.c (enum): Add PREFIX_EVEX_0F3A44.
	(enum): Remove VEX_LEN_0F3A44_P_2.
	(vex_len_table): Ditto.
	(enum): Remove VEX_W_0F3A44_P_2.
	(vew_w_table): Ditto.
	(prefix_table): Adjust instructions (see prefixes above).
	* i386-dis-evex.h (evex_table):
	Add new instructions (see prefixes above).
	* i386-gen.c (cpu_flag_init): Add VPCLMULQDQ.
	(bitfield_cpu_flags): Ditto.
	* i386-opc.h (enum): Ditto.
	(i386_cpu_flags): Ditto.
	(CpuUnused): Comment out to avoid zero-width field problem.
	* i386-opc.tbl (vpclmulqdq): New instruction.
	* i386-init.h: Regenerate.
	* i386-tbl.h: Ditto.