Get rid of another QAST::VM.
Get rid of another QAST::VM.

Seems this is one of, if not the last QAST::VM node in code-gen that
should be portable. Of course, still a bunch of pir:: and Q:PIR uses
to go.

cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp,cygx/nqp