Officially the syntax for TEST is "rm,reg"; however TEST is
commutative in every aspect, and as such "reg,mem" is an equivalent
form that NASM has also supported in the past.
Reinstate it properly.
Fixes: https://bugzilla.nasm.us/show_bug.cgi?id=3392962
Reported-by: E. C. Masloch <pushbx@ulukai.org>
Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
