add ultra-light classes/members that work without backend in simple cases

compiler/testData/asJava/ultraLightClasses/enums.kt

@@ -0,0 +1,43 @@
+
+import java.util.function.*
+
+/** should load cls */
+enum class Direction {
+    NORTH, SOUTH, WEST, EAST
+}
+
+/** should load cls */
+enum class Color(val rgb: Int) {
+        RED(0xFF0000),
+        GREEN(0x00FF00),
+        BLUE(0x0000FF)
+}
+
+/** should load cls */
+enum class ProtocolState {
+    WAITING {
+        override fun signal() = TALKING
+    },
+
+    TALKING {
+        override fun signal() = WAITING
+    };
+
+    abstract fun signal(): ProtocolState
+}
+
+/** should load cls */
+enum class IntArithmetics : BinaryOperator<Int>, IntBinaryOperator {
+    PLUS {
+        override fun apply(t: Int, u: Int): Int = t + u
+    },
+    TIMES {
+        override fun apply(t: Int, u: Int): Int = t * u
+    };
+
+    override fun applyAsInt(t: Int, u: Int) = apply(t, u)
+}
+
+class C {
+    val enumConst: Direction? = Direction.EAST
+}