Pavel Yaskevich 1f222f307e [ConstraintSystem] Make sure pattern matching tuple destructuring works both ways ...

Consider following example:

```swift
enum E {
  case foo((x: Int, y: Int))
  case bar(x: Int, y: Int)
}

func test(e: E) {
  if case .foo(let x, let y) = e {}
  if case .bar(let tuple) = e {}
}
```

Both of `if case` expressions have to be supported:

1. `case .foo(let x, let y) = e` allows a single tuple
   parameter to be "destructured" into multiple arguments.

2. `case .bar(let tuple) = e` allows to match multiple
   parameters with a single tuple argument.

Resolves: rdar://problem/60061646

2020-03-05 14:05:35 -08:00

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