Alastair Houghton 418ae45ce2 [Concurrency] Make initial executor construction fully thread safe. ...

I had originally thought that we'd get away without this because the
executor construction generally happens in the async `main` function,
but of course if a program doesn't already use Swift Concurrency,
and someone uses it from a plug-in or library it loads, there's a
risk that we might have a race condition.

rdar://149346132

2025-05-06 11:50:07 +01:00

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