Instead of always requiring a call to be made to pass argument
to `@autoclosure` parameter, it should be allowed to pass argument
by value to `@autoclosure` parameter which can return a function
type.
```swift
func foo<T>(_ fn: @autoclosure () -> T) {}
func bar(_ fn: @autoclosure @escaping () -> Int) { foo(fn) }
```
Suggest to add `()` (form a call) to correctly forward argument function
originated from `@autoclosure` parameter to function parameter itself
marked as `@autoclosure`.
Currently logic in `matchCallArguments` could only detect argument
being an @autoclosure parameter for normal calls and operators.
This patch extends it to support subscripts and unresolved member calls.
Swift versions < 5 allowed argument passed to @autoclosure parameter
to be @autoclosure function type, we need to make sure that such
behavior is preserved.
