Port a couple more stubs to x64.

runtime/lib/integers.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
 // TODO(srdjan): fix limitations.
 // - shift amount must be a Smi.
 class IntegerImplementation {
   factory IntegerImplementation._uninstantiable() {
     throw const UnsupportedOperationException(
         "IntegerImplementation can only be allocated by the VM");
   }
@@ skipping 163 matching lines @@
 // Represents integers that cannot be represented by Smi but fit into 64bits.
 class Mint extends IntegerImplementation implements int {
   factory Mint._uninstantiable() {
     throw const UnsupportedOperationException(
         "Mint can only be allocated by the VM");
   }
   int hashCode() {
     return this;
   }
   int operator ~() native "Mint_bitNegate";
+
+  // Shift by mint exceeds range that can be handled by the VM.
+  int sarFromInt(int other) {
+    if (other < 0) {
+      return -1;
+    } else {
+      return 0;
+    }
+  }
+  int shlFromInt(int other) {
+    throw const OutOfMemoryException();
+  }
 }
 
 // A number that can be represented as Smi or Mint will never be represented as
 // Bigint.
 class Bigint extends IntegerImplementation implements int {
   factory Bigint._uninstantiable() {
     throw const UnsupportedOperationException(
         "Bigint can only be allocated by the VM");
   }
   int hashCode() {
     return this;
   }
   int operator ~() native "Bigint_bitNegate";
 
   // Shift by bigint exceeds range that can be handled by the VM.
   int sarFromInt(int other) {
     if (other < 0) {
       return -1;
     } else {
       return 0;
     }
   }
   int shlFromInt(int other) {
     throw const OutOfMemoryException();
   }
 }