Don't taint parent thread of at_threads with sticky

Co-authored-by: Gabriel Baraldi <baraldigabriel@gmail.com>

Author: vchuravy

base/threadingconstructs.jl

@@ -149,6 +149,8 @@ function threading_run(fun, static)
     n = threadpoolsize()
     tid_offset = threadpoolsize(:interactive)
     tasks = Vector{Task}(undef, n)
+    ct = current_task()
+    ct_static = ct.static
     for i = 1:n
         t = Task(() -> fun(i)) # pass in tid
         t.sticky = static
@@ -162,6 +164,7 @@ function threading_run(fun, static)
         tasks[i] = t
         schedule(t)
     end
+    ct.static = ct_static
     for i = 1:n
         Base._wait(tasks[i])
     end