Remove task stickiness check/spread in _wait2(t1, t2)

Author: kpamnany

base/task.jl

@@ -318,23 +318,12 @@ end
 function _wait2(t::Task, waiter::Task)
     if !istaskdone(t)
         lock(t.donenotify)
-        if !istaskdone(t)
-            push!(t.donenotify.waitq, waiter)
-            unlock(t.donenotify)
-            # since _wait2 is similar to schedule, we should observe the sticky
-            # bit, even if we aren't calling `schedule` due to this early-return
-            if waiter.sticky && Threads.threadid(waiter) == 0 && !GC.in_finalizer()
-                # Issue #41324
-                # t.sticky && tid == 0 is a task that needs to be co-scheduled with
-                # the parent task. If the parent (current_task) is not sticky we must
-                # set it to be sticky.
-                # XXX: Ideally we would be able to unset this
-                current_task().sticky = true
-                tid = Threads.threadid()
-                ccall(:jl_set_task_tid, Cint, (Any, Cint), waiter, tid-1)
+        try
+            if !istaskdone(t)
+                push!(t.donenotify.waitq, waiter)
+                return nothing
             end
-            return nothing
-        else
+        finally
             unlock(t.donenotify)
         end
     end