Provide "toString" for reflection objects

compiler/testData/codegen/boxWithStdlib/reflection/methodsFromAny/packageForJavaStaticToString.kt

@@ -0,0 +1,8 @@
+import kotlin.test.*
+import kotlin.reflect.jvm.kotlinPackage
+
+fun box(): String {
+    val p = javaClass<String>().kotlinPackage
+    if ("$p" != "package java.lang.String") return "Fail: $p"
+    return "OK"
+}