x86: Set Vex=1 on VEX.128 only vmovq

x86: Set Vex=1 on VEX.128 only vmovq

AVX "VMOVQ xmm1, xmm2/m64" and "VMOVQ xmm1/m64, xmm2" can only be
encoded with VEX.128.  Set Vex=1 on VEX.128 only vmovq and update
assembler tests.

gas/

	PR gas/23665
	* testsuite/gas/i386/avx-scalar-intel.d: Updated.
	* testsuite/gas/i386/avx-scalar.d: Likewise.
	* testsuite/gas/i386/x86-64-avx-scalar-intel.d: Likewise.
	* testsuite/gas/i386/x86-64-avx-scalar.d: Likewise.

opcodes/

	PR gas/23665
	* i386-dis.c (vex_len_table): Update VEX_LEN_0F7E_P_1 and
	VEX_LEN_0FD6_P_2 entries.
	* i386-opc.tbl: Set Vex=1 on VEX.128 only vmovq.
	* i386-tbl.h: Regenerated.