Cleanup: fix some compiler warnings (mostly deprecations, javaClass)

compiler/tests/org/jetbrains/kotlin/cli/WrongBytecodeVersionTest.kt

@@ -35,7 +35,7 @@ class WrongBytecodeVersionTest : KtUsefulTestCase() {
         val librarySource = File(directory, "A.kt")
         val usageSource = File(directory, "B.kt")
 
-        val tmpdir = KotlinTestUtils.tmpDir(javaClass.simpleName)
+        val tmpdir = KotlinTestUtils.tmpDir(this::class.java.simpleName)
 
         val environment = KotlinTestUtils.createEnvironmentWithMockJdkAndIdeaAnnotations(testRootDisposable)
         LoadDescriptorUtil.compileKotlinToDirAndGetModule(listOf(librarySource), tmpdir, environment)

compiler/tests/org/jetbrains/kotlin/cli/jvm/repl/GenericReplTest.kt

@@ -148,7 +148,7 @@ internal class TestRepl(
     }
 
     private fun makeScriptDefinition(templateClasspath: List<File>, templateClassName: String): KotlinScriptDefinition {
-        val classloader = URLClassLoader(templateClasspath.map { it.toURI().toURL() }.toTypedArray(), this.javaClass.classLoader)
+        val classloader = URLClassLoader(templateClasspath.map { it.toURI().toURL() }.toTypedArray(), this::class.java.classLoader)
         val cls = classloader.loadClass(templateClassName)
         return KotlinScriptDefinitionFromAnnotatedTemplate(cls.kotlin, null, null, emptyMap())
     }