swift

f2f4cf23 - [Concurrency] Unbreak priority tests so they actually run & fix them

[Concurrency] Unbreak priority tests so they actually run & fix them if #available + -disable-availability-checking seems to have been broken since... TBD since when exactly. This means that these tests were not executing at all (!), and when available became fixed, they actually started executing and seems they hanged. This fixes the tests however we should look into any other tests which may have suffered from this and also since when these tests started hanging -- it likely is a change in how isolation was inferred. resolves rdar://154765383