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/text/AttributedCharacterIterator.java

@@ -104,6 +104,7 @@ public interface AttributedCharacterIterator extends CharacterIterator {
          *
          * @param name the name of {@code Attribute}
          */
+        @SuppressWarnings("this-escape")
         protected Attribute(String name) {
             this.name = name;
             if (this.getClass() == Attribute.class) {