Replace parent with parentFile, relativePath with relativeTo

compiler/tests/org/jetbrains/kotlin/codegen/AbstractBytecodeListingTest.kt

@@ -27,7 +27,7 @@ public abstract class AbstractBytecodeListingTest : CodegenTestCase() {
         createEnvironmentWithMockJdkAndIdeaAnnotations(ConfigurationKind.ALL)
         loadFileByFullPath(filename)
         val ktFile = File(filename)
-        val txtFile = File(ktFile.parent, ktFile.nameWithoutExtension + ".txt")
+        val txtFile = File(ktFile.parentFile, ktFile.nameWithoutExtension + ".txt")
         val generatedFiles = CodegenTestUtil.generateFiles(myEnvironment, myFiles)
                 .getClassFiles()
                 .sortedBy { it.relativePath }

compiler/tests/org/jetbrains/kotlin/jvm/runtime/AbstractJvmRuntimeDescriptorLoaderTest.kt

@@ -141,7 +141,7 @@ public abstract class AbstractJvmRuntimeDescriptorLoaderTest : TestCaseWithTmpdi
         val packageScopes = arrayListOf<JetScope>()
         val classes = arrayListOf<ClassDescriptor>()
         for (classFile in allClassFiles) {
-            val className = tmpdir.relativePath(classFile).substringBeforeLast(".class").replace('/', '.').replace('\\', '.')
+            val className = classFile.relativeTo(tmpdir).substringBeforeLast(".class").replace('/', '.').replace('\\', '.')
 
             val klass = classLoader.loadClass(className).sure { "Couldn't load class $className" }
             val header = ReflectKotlinClass.create(klass)?.getClassHeader()