add a GC safepoint in Task.wait (#41441)

vilterp · KristofferC · commit afad5f61f405 · 2021-07-19T11:48:38.000+02:00
(cherry picked from commit 97f817a)
diff --git a/base/task.jl b/base/task.jl
@@ -818,6 +818,7 @@ end
 end
 
 function wait()
+    GC.safepoint()
     W = Workqueues[Threads.threadid()]
     poptask(W)
     result = try_yieldto(ensure_rescheduled)
