src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.replacements/src/org/graalvm/compiler/replacements/JDK9StringSubstitutions.java

rev 52509 : [mq]: graal2

@@ -73,6 +73,10 @@
      * Will be intrinsified with an {@link InvocationPlugin} to a {@link LoadFieldNode}.
      */
     public static native byte[] getValue(String s);
 
     public static native int getCoder(String s);
+
+    public static boolean isCompactString(String s) {
+        return getCoder(s) == 0;
+    }
 }