8028389: NullPointerException compiling annotation values that have bodies

Made sure anonymous class declarations inside class- and package-level annotations are properly entered.

Reviewed-by: jfranck

langtools/test/tools/javac/annotations/neg/AnonSubclass.java

@@ -0,0 +1,13 @@
+/*
+ * @test /nodynamiccopyright/
+ * @bug 8028389
+ * @summary javac should output a proper error message when given something
+ * like new Object(){} as annotation argument.
+ *
+ * @compile/fail/ref=AnonSubclass.out -XDrawDiagnostics AnonSubclass.java
+ */
+
+@AnonSubclass(new Object(){})
+@interface AnonSubclass {
+    String value();
+}