x86: Add support for Intel HRESET instruction

gas/

	* NEWS: Add Intel HRESET.
	* config/tc-i386.c (cpu_arch): Add .hreset.
	(cpu_noarch): Likewise.
	* doc/c-i386.texi: Document .hreset, nohreset.
	* testsuite/gas/i386/i386.exp: Run HRESET tests.
	* testsuite/gas/i386/hreset.d: New file.
	* testsuite/gas/i386/x86-64-hreset.d: Likewise.
	* testsuite/gas/i386/hreset.s: Likewise.

opcodes/

	* i386-dis.c (PREFIX_0F3A0F): New.
	(MOD_0F3A0F_PREFIX_1): Likewise.
	(REG_0F3A0F_PREFIX_1_MOD_3): Likewise.
	(RM_0F3A0F_P_1_MOD_3_REG_0): Likewise.
	(prefix_table): Add PREFIX_0F3A0F.
	(mod_table): Add MOD_0F3A0F_PREFIX_1.
	(reg_table): Add REG_0F3A0F_PREFIX_1_MOD_3.
	(rm_table): Add RM_0F3A0F_P_1_MOD_3_REG_0.
	* i386-gen.c (cpu_flag_init): Add HRESET_FLAGS,
	CPU_ANY_HRESET_FLAGS.
	(cpu_flags): Add CpuHRESET.
	(output_i386_opcode): Allow 4 byte base_opcode.
	* i386-opc.h (enum): Add CpuHRESET.
	(i386_cpu_flags): Add cpuhreset.
	* i386-opc.tbl: Add Intel HRESET instruction.
	* i386-init.h: Regenerate.
	* i386-tbl.h: Likewise.