Reapply "Refactor Date implementation in VM."

lib/compiler/implementation/lib/mockimpl.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.
 
 // Mocks of classes and interfaces that Leg cannot read directly.
 
 // TODO(ahe): Remove this file.
 
 class JSSyntaxRegExp implements RegExp {
   final String pattern;
@@ skipping 225 matching lines @@
       if (epochValue === null) {
         throw new IllegalArgumentException(formattedString);
       }
       if (addOneMillisecond) epochValue++;
       return new DateImplementation.fromEpoch(epochValue, isUtc);
     } else {
       throw new IllegalArgumentException(formattedString);
     }
   }
 
+  static final int _MAX_VALUE = 8640000000000000;
+
   DateImplementation.fromEpoch(this.value, [bool isUtc = false])
-      : _isUtc = checkNull(isUtc);
+      : _isUtc = checkNull(isUtc) {
+    if (value.abs() > _MAX_VALUE) throw new IllegalArgumentException(value);
+  }
 
   bool operator ==(other) {
     if (!(other is DateImplementation)) return false;
     return (value == other.value);
   }
 
   bool operator <(Date other) => value < other.value;
 
   bool operator <=(Date other) => value <= other.value;
 
@@ skipping 112 matching lines @@
   factory List.from(Iterable<E> other) {
     List<E> result = new List<E>();
     // TODO(ahe): Use for-in when it is implemented correctly.
     Iterator<E> iterator = other.iterator();
     while (iterator.hasNext()) {
       result.add(iterator.next());
     }
     return result;
   }
 }