Make stdlib work with -Xmultifile-package-facades.

Fixed wrong owner mapping in presence of -Xmultifile-package-facades.
Fixed backing field mapping issue.
Added more tests.

generators/src/org/jetbrains/kotlin/generators/tests/GenerateTests.kt

@@ -183,7 +183,11 @@ fun main(args: Array<String>) {
             model("codegen/boxInline", extension = "1.kt", testMethod = "doBoxTestWithInlineCheck")
         }
 
-        testClass(javaClass<AbstractCompileKotlinAgainstMultifileKotlinTest>(), "CompileKotlinAgainstMultifileKotlinTestGenerated") {
+        testClass(AbstractBlackBoxMultifileClassCodegenTest::class.java, "BlackBoxMultifileClassKotlinTestGenerated") {
+            model("codegen/boxMultifileClasses", extension = "1.kt", testMethod = "doTestMultifileClassAgainstSources")
+        }
+
+        testClass(AbstractCompileKotlinAgainstMultifileKotlinTest::class.java, "CompileKotlinAgainstMultifileKotlinTestGenerated") {
             model("codegen/boxMultifileClasses", extension = "1.kt", testMethod = "doBoxTest")
         }