target/i386: clean up AAM/AAD

target/i386: clean up AAM/AAD

The 32-bit AAM/AAD opcodes are using helpers that read and write flags and
env->regs[R_EAX].  Clean them up so that the table correctly includes AX
as a 16-bit input and output.

No real reason to do it to be honest, but they are nice one-output helpers
and it removes the masking of env->regs[R_EAX] that generic load/writeback
code already does.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20240522123912.608497-1-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>