Support Intel WRMSRNS

gas/ChangeLog:

        * NEWS: Support Intel WRMSRNS.
        * config/tc-i386.c: Add wrmsrns.
        * doc/c-i386.texi: Document .wrmsrns.
        * testsuite/gas/i386/i386.exp: Add WRMSRNS tests.
        * testsuite/gas/i386/wrmsrns-intel.d: New test.
        * testsuite/gas/i386/wrmsrns.d: Ditto.
        * testsuite/gas/i386/wrmsrns.s: Ditto.
        * testsuite/gas/i386/x86-64-wrmsrns-intel.d: Ditto.
        * testsuite/gas/i386/x86-64-wrmsrns.d: Ditto.

opcodes/ChangeLog:

	* i386-dis.c (PREFIX_0F01_REG_0_MOD_3_RM_6): New.
	(prefix_table): Add PREFIX_0F01_REG_0_MOD_3_RM_6.
	(rm_table): New entry for wrmsrns.
	* i386-gen.c (cpu_flag_init): Add CPU_WRMSRNS_FLAGS
	and CPU_ANY_WRMSRNS_FLAGS.
	(cpu_flags): Add CpuWRMSRNS.
        * i386-init.h: Regenerated.
        * i386-opc.h (CpuWRMSRNS): New.
	(i386_cpu_flags): Add cpuwrmsrns.
        * i386-opc.tbl: Add WRMSRNS instructions.
        * i386-tbl.h: Regenerated.