Pavel Yaskevich 0562c31cad [CSSimplify] Look through optionals in contextual type while resolving a closure ...

Let's look through all optionals associated with contextual
type to make it possible to infer parameter/result type of
the closure faster e.g.:

```swift
func test(_: ((Int) -> Void)?) {
   ...
}

test { $0 + ... }
```

In this case dropping optionality from contextual type
`((Int) -> Void)?` allows `resolveClosure` to infer type
of `$0` directly (via `getContextualParamAt`) instead of
having to use type variable inference mechanism.

2021-06-24 15:29:01 -07:00

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