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/concurrent/ConcurrentHashMap.java

@@ -847,6 +847,7 @@ public class ConcurrentHashMap<K,V> extends AbstractMap<K,V>
      *
      * @param m the map
      */
+    @SuppressWarnings("this-escape")
     public ConcurrentHashMap(Map<? extends K, ? extends V> m) {
         this(m.size());
         putAll(m);