[SE-0296] Make "await" with no potential suspension points well-formed. (#1226)
[SE-0296] Make "await" with no potential suspension points well-formed. (#1226)

* [SE-0296] Try to clarify potential suspension points

* [SE-0296] Make "await" with no potential suspension points well-formed.

This lines up with the behavior of `try`. There is no reason to diverge.
apple/swift-evolution,natecook1000/swift-evolution,apple/swift-evolution,abertelrud/swift-evolution,abertelrud/swift-evolution,natecook1000/swift-evolution