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/PipedOutputStream.java

@@ -59,6 +59,7 @@ public class PipedOutputStream extends OutputStream {
      * @param      snk   The piped input stream to connect to.
      * @throws     IOException  if an I/O error occurs.
      */
+    @SuppressWarnings("this-escape")
     public PipedOutputStream(PipedInputStream snk)  throws IOException {
         connect(snk);
     }