Expand type synonyms when Linting a forall
Trac #14939 showed a type like type Alg cls ob = ob f :: forall (cls :: * -> Constraint) (b :: Alg cls *). b where the kind of the forall looks like (Alg cls *), with a free cls. This tripped up Core Lint. I fixed this by making Core Lint a bit more forgiving, expanding type synonyms if necessary. I'm worried that this might not be the whole story; notably typeKind looks suspect. But it certainly fixes this problem.
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