Add final modifier.

Author: pecimuth

compiler/src/jdk.graal.compiler.test/src/jdk/graal/compiler/hotspot/test/TestNewInstanceWithException.java

@@ -572,7 +572,7 @@ public void runSubprocessTest(Runnable r, String... args) throws IOException, In
     /**
      * The argument setting the maximum heap space of the subprocess.
      */
-    public static String MAX_HEAP_SPACE_ARG = "-Xmx64m";
+    public static final String MAX_HEAP_SPACE_ARG = "-Xmx64m";
 
     public static class TestNewInstanceWithException1 extends TestNewInstanceWithException {