Rewrite negative const tests into a few multi tests.

tests/language/src/ConstConstructorSyntaxTest.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 main() {
   var c0 = const C0(); /// 01: compile-time error
   var i0 = const I0(); /// 02: compile-time error
   var c1 = const C1();
   var c2 = const C2(); /// 03: compile-time error
+  var c3 = const C3();
 }
 
 interface I0 default C0 {
   I0();
 }
 
 class C0 implements I0 {
   C0();
 }
 
 class C1 {
   const C1();
   var modifiable; /// 04: compile-time error
 }
 
 class C2 {
   C2();
 }
+
+class C3 {
+  const C3()
+      : field = new C0() /// 05: compile-time error
+  ;
+  final field = null;
+}