Fix issue 1845: Mint BIT_AND Smi was incorrect for negative Smi-s. Jump to slow case on negative Sm…

tests/standalone/src/MediumIntegerTest.dart

 // Copyright (c) 2011, 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.
 // Testing Mints. Note that the tests may not work on 64-bit machines,
 // as Smi's would be used to represent many of the numbers.
 
 #library("MediumIntegerTest.dart");
 #import("dart:coreimpl");
 
 class MediumIntegerTest {
@@ skipping 112 matching lines @@
     checkSmi(b);
     checkBigint(a * b);
     Expect.equals(46116860184273879040, a * b);
     b = 1000000000000000000;
     checkMint(a);
     checkMint(b);
     checkBigint(a * b);
     Expect.equals(4611686018427387904000000000000000000, a * b);
   }
 
+  static testMintAnd(mint) {
+    // Issue 1845.
+    final int t = 0;
+    var res = mint & (t - 1);
+    Expect.equals(mint, res);
+  }
+
   // TODO(srdjan): Add more tests.
 
   static void testMain() {
     checkMint(getMint());
     Expect.equals(1234567890123456789, getMint());
     testSmiOverflow();
     testMintAdd();
     testMintSub();
     testMintMul();
     testMintDiv();
+    testMintAnd(-1925149952);
+    testMintAnd(1925149952);
     var a = 100000000000;
     var b = 100000000001;
     checkMint(a);
     checkMint(b);
     Expect.equals(false, a.hashCode() == b.hashCode());
     Expect.equals(true, a.hashCode() == (b - 1).hashCode());
   }
 }
 
 main() {
-  MediumIntegerTest.testMain();
+  for (int i = 0; i < 1000; i++) {
+    MediumIntegerTest.testMain();
+  }
 }