Merge boxWithStdlib testData into box, delete BoxWithStdlib test

compiler/testData/codegen/box/reflection/classLiterals/genericClass.kt

@@ -0,0 +1,11 @@
+// WITH_REFLECT
+
+import kotlin.test.assertEquals
+
+class Generic<K, V>
+
+fun box(): String {
+    val g = Generic::class
+    assertEquals("Generic", g.simpleName)
+    return "OK"
+}