Revert "Apply IO stricness hack only to information about arguments"

This reverts commit 4f055ee8d890e23c8ad02a5864d0b6069420bbec.
We need a discussion about this in #8598 first, and I do not want this
to influence my nested CPR nofib results.
In deferType, return convRes = Converges NoCPR

because this is the right-identity to `bothDmdResult`, and this is the
right thing to do in a lazy context.
Actually create a nested CPR worker-wrapper