[flang] Catch non-CONTIGUOUS assumed-rank with ASYNCHRONOUS/VOLATILE … (#71243)

…forwarded to CONTIGUOUS dummy

No object with the ASYNCHRONOUS or VOLATILE attribute can go through the
copy-in/copy-out protocol necessary for argument association with a
contiguous dummy array argument. The check for this constraint missed
the case of an assumed-rank array without an explicit CONTIGUOUS
attribute being forwarded on to a CONTIGUOUS dummy argument.