`exprOkForSpeculation` for Note [IO hack in the demand analyser]

In #14998 I realised that the notion of speculative execution
*exactly matches* eager evaluation of expressions in a case alternative
where the scrutinee is an IO action.

Normally we have to `deferIO` any result from that single case
alternative to prevent this speculative execution, so we had a special
case in place in the demand analyser that would check if the scrutinee
was a prim-op, in which case we assumed that it would be ok to do the
eager evaluation.

Now we just check if the scrutinee is `exprOkForSpeculation`,
corresponding to the notion that we want to push evaluation of the
scrutinee *after* eagerly evaluating stuff from the case alternative.

This fixes #14988, because it resolves the last open Item 4 there.

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