Write outer class info for closures

compiler/testData/codegen/boxWithStdlib/reflection/lambda/lambdaInObjectExpression.kt

@@ -0,0 +1,18 @@
+open class C(val a: Any)
+
+fun box(): String {
+    val l = object : C({}) {
+    }
+
+    val javaClass = l.a.javaClass
+    val enclosingMethod = javaClass.getEnclosingConstructor()
+    if (enclosingMethod?.getName() != "_DefaultPackage\$box\$l\$1") return "ctor: $enclosingMethod"
+
+    val enclosingClass = javaClass.getEnclosingClass()
+    if (!enclosingClass!!.getName().startsWith("_DefaultPackage\$box\$l\$1")) return "enclosing class: $enclosingClass"
+
+    val declaringClass = javaClass.getDeclaringClass()
+    if (declaringClass != null) return "anonymous function has a declaring class: $declaringClass"
+
+    return "OK"
+}