Doug Gregor 4325cf429d Ensure that async/synchronous overloading works in implicit-async closures. ...

When we are within a closure that is not required to be asynchronous
(i.e., it has no `await` in it), make sure that we prefer synchronous
functions to asynchronous ones, even if this closure will later be
converted to `async` and the constraint system knows that.

Fixes rdar://88692889.

2022-02-09 12:47:04 -08:00

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