Doug Gregor dd075c64c9 [Concurrency] Treat 'await' as a contextual keyword. ...

Replace the uglified '__await' keyword with a contextual keyword
'await'. This is more of what we would actually want for the
concurrency model.

When concurrency is enabled, this will be a source-breaking change,
because this is valid Swift code today:

```swift
  struct MyFuture<T> {
    func await() ->  }
    func doSomething() {
      let result = await()
    }
  }
```

but the call to `await()` will be parsed as an await expression when
concurrency is enabled. The source break is behind the experimental
concurrency flag, but this way we can see how much of an issue it is
in practice.

2020-08-13 10:34:51 -07:00

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