Make Class<*>.kotlinPackage nullable

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

@@ -1,8 +0,0 @@
-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"
-}