Change IllegalArgumentException to ArgumentError.

pkg/fixnum/test/int_32_test.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.
 
 #library("int32test");
 #import('../fixnum.dart');
 
 void main() {
   Expect.equals("0", new int32.fromInt(0).toString());
   Expect.equals("1", new int32.fromInt(1).toString());
@@ skipping 13 matching lines @@
   Expect.equals("-100", (new int32.fromInt(-1) << 8).toHexString());
   Expect.equals("ffffff",
       new int32.fromInt(-1).shiftRightUnsigned(8).toHexString());
 
   Expect.equals("123456789", new int32.fromInt(123456789).toString());
   Expect.equals("75bcd15", new int32.fromInt(123456789).toHexString());
   Expect.equals("223101104124", new int32.fromInt(123456789).toRadixString(5));
 
   try {
     new int32.fromInt(17) >> -1;
-    Expect.fail("x >> -1 should throw IllegalArgumentException");
-  } on IllegalArgumentException catch (e) {
+    Expect.fail("x >> -1 should throw ArgumentError");
+  } on ArgumentError catch (e) {
   }
 
   try {
     new int32.fromInt(17) << -1;
-    Expect.fail("x >> -1 should throw IllegalArgumentException");
-  } on IllegalArgumentException catch (e) {
+    Expect.fail("x >> -1 should throw ArgumentError");
+  } on ArgumentError catch (e) {
   }
 
   try {
     new int32.fromInt(17).shiftRightUnsigned(-1);
-    Expect.fail("x >> -1 should throw IllegalArgumentException");
-  } on IllegalArgumentException catch (e) {
+    Expect.fail("x >> -1 should throw ArgumentError");
+  } on ArgumentError catch (e) {
   }
 
   // wraparound
   Expect.equals("-67153019", (new int32.fromInt(123456789) *
       new int32.fromInt(987654321)).toString());
   Expect.equals("121932631112635269", (new int64.fromInt(123456789) *
       new int32.fromInt(987654321)).toString());
   Expect.equals("121932631112635269", (new int32.fromInt(123456789) *
       new int64.fromInt(987654321)).toString());
   Expect.equals("121932631112635269", (new int64.fromInt(123456789) *
@@ skipping 91 matching lines @@
   }
 
   try {
     new int32.fromInt(17) < null;
     Expect.fail("x >= null should throw NullPointerException");
   } on NullPointerException catch (e) {
   }
 
   Expect.isFalse(new int32.fromInt(17) == null);
 }