Doug Gregor 238290cdc4 [SE-0296] Enable async/await by default. ...

Always parse `async` and `await`, allowing the definition and use of
asynchronous functions without the "experimental concurrency" flag.

Note that, at present, use of asynchronous functions requires one to
explicitly import or link against the `_Concurrency` library. We'll
sort this out in a follow-up change.

Tracked by rdar://73455330.

2021-02-05 09:51:46 -08:00

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