In Trac #13027, comment:20, I noticed that wrappers created after
demand analysis weren't recording the evaluated-ness of strict
constructor arguments.  In the ticket that led to a (debatable)
Lint error but in general the more we know about evaluated-ness
the better we can optimise.

This commit adds that info both in the worker (on args) and in
the wrapper (on CPR result patterns).

See Note [Record evaluated-ness in worker/wrapper] in WwLib

On the way I defined Id.setCaseBndrEvald, and used it to shorten
the code in a few other places