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

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

src/java.base/share/classes/sun/security/util/BitArray.java

@@ -115,6 +115,7 @@ public class BitArray {
      * Create a BitArray whose bits are those of the given array
      * of Booleans.
      */
+    @SuppressWarnings("this-escape")
     public BitArray(boolean[] bits) {
         length = bits.length;
         repn = new byte[(length + 7)/8];