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/nio/cs/HKSCS.java

@@ -355,6 +355,7 @@ public class HKSCS {
                 return encodeBufferLoop(src, dst);
         }
 
+        @SuppressWarnings("this-escape")
         private byte[] repl = replacement();
         protected void implReplaceWith(byte[] newReplacement) {
             repl = newReplacement;