Add AVX512DQ instructions and their AVX512VL variants.

Add AVX512DQ instructions and their AVX512VL variants.

gas/

	* config/tc-i386.c (cpu_arch): Add .avx512dq, CPU_AVX512DQ_FLAGS.
	* doc/c-i386.texi: Document avx512dq/.avx512dq.

gas/testsuite/

	* gas/i386/avx512dq-intel.d: New.
	* gas/i386/avx512dq.d: New.
	* gas/i386/avx512dq.s: New.
	* gas/i386/avx512dq_vl-intel.d: New.
	* gas/i386/avx512dq_vl.d: New.
	* gas/i386/avx512dq_vl.s: New.
	* gas/i386/i386.exp: Run new AVX-512 tests.
	* gas/i386/x86-64-avx512dq-intel.d: New.
	* gas/i386/x86-64-avx512dq.d: New.
	* gas/i386/x86-64-avx512dq.s: New.
	* gas/i386/x86-64-avx512dq_vl-intel.d: New.
	* gas/i386/x86-64-avx512dq_vl.d: New.
	* gas/i386/x86-64-avx512dq_vl.s: New.

opcodes/

	* i386-dis-evex.h: Updated.
	* i386-dis.c (PREFIX enum): Add PREFIX_EVEX_0F54, PREFIX_EVEX_0F55,
	PREFIX_EVEX_0F56, PREFIX_EVEX_0F57, PREFIX_EVEX_0F3A16,
	PREFIX_EVEX_0F3A22, PREFIX_EVEX_0F3A50, PREFIX_EVEX_0F3A51,
	PREFIX_EVEX_0F3A56, PREFIX_EVEX_0F3A57, PREFIX_EVEX_0F3A66,
	PREFIX_EVEX_0F3A67.
	(VEX_LEN enum): Add VEX_LEN_0F92_P_2, VEX_LEN_0F93_P_2,
	VEX_W_0F92_P_2_LEN_0, VEX_W_0F93_P_2_LEN_0.
	(VEX_W enum): Add EVEX_W_0F54_P_0, EVEX_W_0F54_P_2, EVEX_W_0F55_P_0,
	EVEX_W_0F55_P_2, EVEX_W_0F56_P_0, EVEX_W_0F56_P_2, EVEX_W_0F57_P_0,
	EVEX_W_0F57_P_2, EVEX_W_0F78_P_2, EVEX_W_0F79_P_2, EVEX_W_0F7A_P_2,
	EVEX_W_0F7B_P_2, EVEX_W_0F3838_P_1, EVEX_W_0F3839_P_1,
	EVEX_W_0F3A16_P_2, EVEX_W_0F3A22_P_2, EVEX_W_0F3A50_P_2,
	EVEX_W_0F3A51_P_2, EVEX_W_0F3A56_P_2, EVEX_W_0F3A57_P_2,
	EVEX_W_0F3A66_P_2, EVEX_W_0F3A67_P_2.
	(prefix_table): Add entries for new instructions.
	(vex_len_table): Ditto.
	(vex_w_table): Ditto.
	(OP_E_memory): Update xmmq_mode handling.
	* i386-gen.c (cpu_flag_init): Add CPU_AVX512DQ_FLAGS.
	(cpu_flags): Add CpuAVX512DQ.
	* i386-init.h: Regenerared.
	* i386-opc.h (CpuAVX512DQ): New.
	(i386_cpu_flags): Add cpuavx512dq.
	* i386-opc.tbl: Add AVX512DQ instructions.
	* i386-tbl.h: Regenerate.