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/Random.java

@@ -350,6 +350,7 @@ public class Random implements RandomGenerator, java.io.Serializable {
      * @param seed the initial seed
      * @see   #setSeed(long)
      */
+    @SuppressWarnings("this-escape")
     public Random(long seed) {
         if (getClass() == Random.class)
             this.seed = new AtomicLong(initialScramble(seed));