8192944: Miscellaneous changes imported from jsr166 CVS 2017-12-08

Reviewed-by: martin, psandoz, chegar

src/java.base/share/classes/java/util/concurrent/CountedCompleter.java

@@ -735,7 +735,7 @@ public abstract class CountedCompleter<T> extends ForkJoinTask<T> {
         CountedCompleter<?> a = this, s = a;
         while (a.onExceptionalCompletion(ex, s) &&
                (a = (s = a).completer) != null && a.status >= 0 &&
-               a.recordExceptionalCompletion(ex) == EXCEPTIONAL)
+               isExceptionalStatus(a.recordExceptionalCompletion(ex)))
             ;
     }