Merge boxWithStdlib testData into box, delete BoxWithStdlib test

compiler/testData/codegen/box/reflection/noReflectAtRuntime/simpleClassLiterals.kt

@@ -0,0 +1,14 @@
+// WITH_RUNTIME
+
+import kotlin.test.assertNotNull
+
+class Klass
+
+fun box(): String {
+    assertNotNull(Int::class)
+    assertNotNull(String::class)
+    assertNotNull(Klass::class)
+    assertNotNull(Error::class)
+
+    return "OK"
+}