8325189: Enable this-escape javac warning in java.base

Reviewed-by: alanb, erikj, naoto, smarks, ihse, joehw, lancea, weijun

src/java.base/share/classes/java/util/HashSet.java

@@ -116,6 +116,7 @@ public class HashSet<E>
      * @param c the collection whose elements are to be placed into this set
      * @throws NullPointerException if the specified collection is null
      */
+    @SuppressWarnings("this-escape")
     public HashSet(Collection<? extends E> c) {
         map = HashMap.newHashMap(Math.max(c.size(), 12));
         addAll(c);