vm: COPY_NIL_FLAGS -> COPY_FLAGS_TO_FROM, comment update.
vm: COPY_NIL_FLAGS -> COPY_FLAGS_TO_FROM, comment update.

This was done because I intend to add a new flag soon, so this macro will handle more
than just nility.

crasm/lily,crasm/lily,crasm/lily,boardwalk/lily,boardwalk/lily