X86: Add ptwrite instruction

X86: Add ptwrite instruction

Implement ptwrite instruction defined in Intel64 and IA-32 Architectures
Software Developer’s Manual, June 2016.

gas/

	* config/tc-i386.c (cpu_arch): Add .ptwrite.
	* doc/c-i386.texi: Document ptwrite and .ptwrite.
	* testsuite/gas/i386/i386.exp: Run ptwrite, ptwrite-intel,
	x86-64-ptwrite and x86-64-ptwrite-intel.
	* testsuite/gas/i386/ptwrite-intel.d: New file.
	* testsuite/gas/i386/ptwrite.d: Likewise.
	* testsuite/gas/i386/ptwrite.s: Likewise.
	* testsuite/gas/i386/x86-64-ptwrite-intel.d: Likewise.
	* testsuite/gas/i386/x86-64-ptwrite.d: Likewise.
	* testsuite/gas/i386/x86-64-ptwrite.s: Likewise.

opcodes/

	* i386-dis.c (PREFIX_MOD_0_0FAE_REG_4): New.
	(PREFIX_MOD_3_0FAE_REG_4): Likewise.
	(prefix_table): Add PREFIX_MOD_0_0FAE_REG_4 and
	PREFIX_MOD_3_0FAE_REG_4.
	(mod_table): Use PREFIX_MOD_0_0FAE_REG_4 and
	PREFIX_MOD_3_0FAE_REG_4.
	* i386-gen.c (cpu_flag_init): Add CPU_PTWRITE_FLAGS.
	(cpu_flags): Add CpuPTWRITE.
	* i386-opc.h (CpuPTWRITE): New.
	(i386_cpu_flags): Add cpuptwrite.
	* i386-opc.tbl: Add ptwrite instruction.
	* i386-init.h: Regenerated.
	* i386-tbl.h: Likewise.