Analysis: add LC testdata with current behaviour

compiler/testData/asJava/ultraLightClasses/classModifiers.lib.java

@@ -0,0 +1,12 @@
+public abstract class Season /* pkg.Season*/ {
+  private  Season();//  .ctor()
+
+
+  class Nested ...
+
+  }
+
+public static final class Nested /* pkg.Season.Nested*/ extends pkg.Season {
+  public  Nested();//  .ctor()
+
+}