8276348: Use blessed modifier order in java.base

Reviewed-by: dfuchs, darcy, iris, rriggs, martin

src/java.base/share/classes/java/io/ObjectStreamClass.java

@@ -2515,7 +2515,7 @@ public class ObjectStreamClass implements Serializable {
         }
 
         // a key composed of ObjectStreamField[] names and types
-        static abstract class Key {
+        abstract static class Key {
             abstract int length();
             abstract String fieldName(int i);
             abstract Class<?> fieldType(int i);