swift

4325cf42 - Ensure that async/synchronous overloading works in implicit-async closures.

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.