Pavel Yaskevich 0a8f596736 [Diagnostics] Port contextual mismatches involving nil to new framework ...

Detect and diagnose contextual failures originating in an attempt
to convert `nil` to some other non-optional type e.g.

```swift
let _: Int = nil // can't initialize `Int` with `nil`

func foo() -> Int {
  return nil // can't return `nil` from `foo`
}

_ = 1 + nil // there is no `+` overload which accepts `Int` and optional
```

2019-08-20 14:23:54 -07:00

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