Improve/fix handling of WordXVector constants in Useless pass #567
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Ensure that `Useless.doitExp` is called with a (non-`NONE`) `Value.t`.
Allow a `Exp.Const (Const.WordXVector ws)` to "optimize" to a `Vector_vector[unit](unitVar, ..., unitVar)` when the elements are useless. Closes MLton#559
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Allow a
Exp.Const (Const.WordXVector ws)to "optimize" to aVector_vector[unit](unitVar, ..., unitVar)when the elements are useless.