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/io/WriteAbortedException.java

@@ -57,6 +57,7 @@ public class WriteAbortedException extends ObjectStreamException {
      * @param s   String describing the exception.
      * @param ex  Exception causing the abort.
      */
+    @SuppressWarnings("this-escape")
     public WriteAbortedException(String s, Exception ex) {
         super(s);
         initCause(null);  // Disallow subsequent initCause