Serialize descriptors for local/anonymous classes on JVM

Reflection needs this information to work for local classes and anonymous
objects

core/runtime.jvm/src/kotlin/jvm/internal/KotlinClass.java

@@ -23,5 +23,18 @@ import java.lang.annotation.RetentionPolicy;
 public @interface KotlinClass {
     int abiVersion();
 
+    Kind kind();
+
     String[] data();
+
+    enum Kind {
+        CLASS,
+
+        /**
+         * A class has this kind if and only if its first non-class container is not a package.
+         */
+        LOCAL_CLASS,
+
+        ANONYMOUS_OBJECT,
+    }
 }

core/runtime.jvm/src/kotlin/jvm/internal/KotlinSyntheticClass.java

@@ -25,8 +25,7 @@ public @interface KotlinSyntheticClass {
 
     Kind kind();
 
-    // Inner classes of local classes have kind LOCAL_CLASS
-    public static enum Kind {
+    enum Kind {
         PACKAGE_PART,
         TRAIT_IMPL,
         LOCAL_TRAIT_IMPL,
@@ -35,7 +34,5 @@ public @interface KotlinSyntheticClass {
         CALLABLE_REFERENCE_WRAPPER,
         LOCAL_FUNCTION,
         ANONYMOUS_FUNCTION,
-        LOCAL_CLASS,
-        ANONYMOUS_OBJECT,
     }
 }