target/i386: Mark MOVNTI as not valid with prefixes 0x66, 0xF2, 0xF3

According to both table A-3 in Volume 2 of Intel 64 and IA-32 Architectures
Software Developer's Manual and table A-3 in Volume 3 of AMD64 Architecture
Programmer's Manual, 0F C3 is decoded as MOVNTI only if the instruction is
not preceded by prefixes 0x66, 0xF2, or 0xF3.

Currently, QEMU does not check the presence of these prefixes when decoding
0F C3, which leads to QEMU happily executing 0F C3 as MOVNTI instead of raising
an expected #UD when any of these prefixes are present, which does not match
the behavior of the real hardware.

This patch fixes this bug by correcting the decode table for MOVNTI so that
it requires that none of the 0x66, 0xF2, and 0xF3 prefixes is present.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Richard Henderson <richard.henderson@linaro.org>
Fixes: 3519b813e1f1 ("target/i386: port extensions of one-byte opcodes to new decoder")
Signed-off-by: Andrey Polivoda <apolivodaa433@gmail.com>
Link: https://lore.kernel.org/r/20260818145837.550059-1-apolivodaa433@gmail.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit 6adc9d9cdc53e2299f3343950d519b6f26e114de)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>