x86: Check VEX/EVEX encoding before checking vector operands

x86: Check VEX/EVEX encoding before checking vector operands

Since

commit 837e225ba1992f9745e5bbbd5e8443243a7f475f
Author: Jan Beulich <jbeulich@suse.com>
Date:   Thu Oct 20 10:01:12 2022 +0200

    x86: re-work AVX-VNNI support

moved AVX-VNNI after AVX512-VNNI, vector Disp8 is applied even when VEX
encoding is selected.  Check VEX/EVEX encoding before checking vector
operands to avoid vector Disp8 with VEX encoding.

	PR gas/29708
	* config/tc-i386.c (match_template): Check VEX/EVEX encoding
	before checking vector operands.
	* testsuite/gas/i386/avx-vnni.d: Updated.
	* testsuite/gas/i386/x86-64-avx-vnni.d: Likewise.
	* testsuite/gas/i386/avx-vnni.s: Add a Disp32 test.
	* testsuite/gas/i386/x86-64-avx-vnni.s: Likewise.