Report error when LHS of class literal is not a class

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

@@ -0,0 +1,9 @@
+import kotlin.test.assertEquals
+
+class Generic<K, V>
+
+fun box(): String {
+    val g = Generic::class
+    assertEquals("Generic", g.simpleName)
+    return "OK"
+}