Detect zero receiver of modInverse (may not converge and time out

tests/corelib/big_integer_arith_vm_test.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 Bigints with and without intrinsics.
 // VMOptions=
 // VMOptions=--no_intrinsify
 
 library big_integer_test;
 import "package:expect/expect.dart";
@@ skipping 217 matching lines @@
   Expect.equals(true, m.isEven);
   try {
     x.modInverse(m);
     Expect.fail("Did not throw UnimplementedError");
   } on UnimplementedError catch (e) {
   }
 }
 
 testBigintModInverse() {
   var x, m;
+  x = 0;
+  m = 1000000001;
+  Expect.equals(0, x.modInverse(m));  // Not coprime.
   x = 1234567890;
   m = 19;
   Expect.equals(11, x.modInverse(m));
   x = 1234567890;
   m = 1000000001;
   Expect.equals(189108911, x.modInverse(m));
   x = 19;
   m = 1000000001;
   Expect.equals(0, x.modInverse(m));  // Not coprime.
   x = 19;
@@ skipping 83 matching lines @@
   testBigintModInverse();
   testBigintNegate();
   testShiftAmount();
   Expect.equals(12345678901234567890, (12345678901234567890).abs());
   Expect.equals(12345678901234567890, (-12345678901234567890).abs());
   var a = 10000000000000000000;
   var b = 10000000000000000001;
   Expect.equals(false, a.hashCode == b.hashCode);
   Expect.equals(true, a.hashCode == (b - 1).hashCode);
 }