Implement RDRSEED, ADX and PRFCHW instructions

Implement RDRSEED, ADX and PRFCHW instructions

gas/

	* config/tc-i386.c: Add ADX, RDSEED and PRFCHW asm directives.
	* doc/c-i386.texi: Document the new directives.

gas/testsuite/

	* gas/i386/i386.exp: Run adx, rdseed and prefetchw tests.
	* gas/i386/x86-64-arch-2.s: Use prefetchw as 3dnow and Prfchw tests.
	* gas/i386/arch-10.s: Likewise.
	* gas/i386/arch-10-1.l: Changed correspondingly.
	* gas/i386/arch-10-2.l: Likewise.
	* gas/i386/arch-10-3.l: Likewise.
	* gas/i386/arch-10-4.l: Likewise.
	* gas/i386/arch-10.d: Likewise.
	* gas/i386/arch-10-lzcnt.d: Likewise.
	* gas/i386/x86-64-arch-2.d: Likewise.
	* gas/i386/x86-64-arch-2-lzcnt.d: Likewise.
	* gas/i386/ilp32/x86-64-arch-2.d: Likewise.
	* gas/i386/arch-10-prefetchw.d: New file.
	* gas/i386/x86-64-arch-2-prefetchw.d: Likewise.
	* gas/i386/rdseed.s: Likewise.
	* gas/i386/rdseed.d: Likewise.
	* gas/i386/rdseed-intel.d: Likewise.
	* gas/i386/adx.s: Likewise.
	* gas/i386/adx.d: Likewise.
	* gas/i386/adx-intel.d: Likewise.
	* gas/i386/x86-64-rdseed.s: Likewise.
	* gas/i386/x86-64-rdseed.d: Likewise.
	* gas/i386/x86-64-rdseed-intel.d: Likewise.
	* gas/i386/x86-64-adx.s: Likewise.
	* gas/i386/x86-64-adx.d: Likewise.
	* gas/i386/x86-64-adx-intel.d: Likewise.

opcodes/

	* i386-dis.c (PREFIX_0F38F6): New.
	(prefix_table): Add adcx, adox instructions.
	(three_byte_table): Use PREFIX_0F38F6.
	(mod_table): Add rdseed instruction.
	* i386-gen.c (cpu_flag_init): Add CpuADX, CpuRDSEED, CpuPRFCHW.
	(cpu_flags): Likewise.
	* i386-opc.h: Add CpuADX, CpuRDSEED, CpuPRFCHW.
	(i386_cpu_flags): Add fields cpurdseed, cpuadx, cpuprfchw.
	* i386-opc.tbl: Add instrcutions adcx, adox, rdseed. Extend
	prefetchw.
	* i386-tbl.h: Regenerate.
	* i386-init.h: Likewise.