Write outer class info for closures

compiler/testData/codegen/boxWithStdlib/reflection/insideLambda/objectInLambda.kt

@@ -0,0 +1,18 @@
+fun box(): String {
+
+    val objectInLambda = {
+        object : Any () {}
+    }()
+
+    val enclosingMethod = objectInLambda.javaClass.getEnclosingMethod()
+    if (enclosingMethod?.getName() != "invoke") return "method: $enclosingMethod"
+
+    val enclosingClass = objectInLambda.javaClass.getEnclosingClass()
+    if (enclosingClass?.getName() != "_DefaultPackage\$box\$objectInLambda\$1") return "enclosing class: $enclosingClass"
+
+    //KT-5092
+    //val declaringClass = objectInLambda.javaClass.getDeclaringClass()
+    //if (declaringClass == null) return "anonymous object hasn't a declaring class"
+
+    return "OK"
+}