Merge pull request swiftlang#38599 from DougGregor/task-yield-5.5

Author: DougGregor

stdlib/public/Concurrency/SourceCompatibilityShims.swift

@@ -29,6 +29,12 @@ extension Task where Success == Never, Failure == Never {
   public static func CancellationError() -> _Concurrency.CancellationError {
     return _Concurrency.CancellationError()
   }
+
+  @available(*, deprecated, renamed: "yield()")
+  @_alwaysEmitIntoClient
+  public static func suspend() async {
+    await yield()
+  }
 }
 
 @available(SwiftStdlib 5.5, *)

stdlib/public/Concurrency/Task.swift

@@ -658,7 +658,6 @@ extension Task where Success == Never, Failure == Never {
   /// the executor immediately resumes execution of the same task.
   /// As such,
   /// this method isn't necessarily a way to avoid resource starvation.
-  @available(*, deprecated, renamed: "suspend()")
   public static func yield() async {
     let currentTask = Builtin.getCurrentAsyncTask()
     let priority = getJobFlags(currentTask).priority ?? Task.currentPriority._downgradeUserInteractive
@@ -668,11 +667,6 @@ extension Task where Success == Never, Failure == Never {
       _enqueueJobGlobal(job)
     }
   }
-
-  @_alwaysEmitIntoClient
-  public static func suspend() async {
-    await yield()
-  }
 }
 
 // ==== UnsafeCurrentTask ------------------------------------------------------