Add missing $!pos update in subcapture compilation
Add missing $!pos update in subcapture compilation

With this, t/p5regex fully passes on the MoarVM backend.

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