Pavel Yaskevich 0ecedfa5ea Revert "[ConstraintSystem] Make it possible to infer subtype bindings through argument conversions" ...

Reverts apple/swift#30006. It caused a regression that we'd like to address before re-landing:

```swift
struct X {
  var cgf: CGFloat
}

func test(x: X?) {
  let _ = (x?.cgf ?? 0) <= 0.5
}
```

This reverts commit 0a6b444b49.
This reverts commit ed255596a6.
This reverts commit 3e01160a2f.
This reverts commit 96297b7e39.

Resolves: rdar://problem/60185506

2020-03-07 20:16:56 -08:00

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