Make Class<*>.kotlinPackage nullable

compiler/testData/codegen/boxWithStdlib/reflection/mapping/package.kt

@@ -6,7 +6,7 @@ import kotlin.test.*
 fun box(): String {
     val facadeJClass = Class.forName("test.TestPackage") as Class<Any>
 
-    assertEquals(facadeJClass, facadeJClass.kotlinPackage.javaFacade)
+    assertEquals(facadeJClass, facadeJClass.kotlinPackage!!.javaFacade)
     assertEquals(facadeJClass, facadeJClass.kotlin.java)
 
     return "OK"

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"
-}

compiler/tests/org/jetbrains/kotlin/codegen/generated/BlackBoxWithStdlibCodegenTestGenerated.java

@@ -3177,12 +3177,6 @@ public class BlackBoxWithStdlibCodegenTestGenerated extends AbstractBlackBoxCode
                 doTestWithStdlib(fileName);
             }
 
-            @TestMetadata("packageForJavaStaticToString.kt")
-            public void testPackageForJavaStaticToString() throws Exception {
-                String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/boxWithStdlib/reflection/methodsFromAny/packageForJavaStaticToString.kt");
-                doTestWithStdlib(fileName);
-            }
-
             @TestMetadata("packageToString.kt")
             public void testPackageToString() throws Exception {
                 String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/boxWithStdlib/reflection/methodsFromAny/packageToString.kt");