KT-650 Prohibit creating class without constructor

compiler/testData/codegen/classes/classObjectMethod.jet

@@ -3,7 +3,7 @@ abstract open class Default {
 }
 
 class MyInt() {
-  class object : Default {
+  class object : Default() {
     override fun defaultValue(): Int = 610
   }
 }

compiler/testData/codegen/classes/inheritedMethod.jet

@@ -2,7 +2,7 @@ open class Foo {
   fun xyzzy(): String = "xyzzy"
 }
 
-class Bar(): Foo {
+class Bar(): Foo() {
   fun test(): String = xyzzy()
 }