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

runtime/lib/integers.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.
 
 // TODO(srdjan): fix limitations.
 // - shift amount must be a Smi.
 class _IntegerImplementation extends _Num {
   // The Dart class _Bigint extending _IntegerImplementation requires a
   // default constructor.
 
@@ skipping 279 matching lines @@
     return r;
   }
 
   // Returns 1/this % m, with m > 0.
   int modInverse(int m) {
     if (m is! int) throw new ArgumentError(m);
     if (m <= 0) throw new RangeError(m);
     if (m is _Bigint) {
       return _toBigint().modInverse(m);
     }
+    if (this == 0) return 0;
     bool ac = m.isEven;
     int u = m;
     int v = this;
     int a = 1,
         b = 0,
         c = 0,
         d = 1;
     while (u != 0) {
       while (u.isEven) {
         u >>= 1;
@@ skipping 251 matching lines @@
   // Shift by mint exceeds range that can be handled by the VM.
   int _shrFromInt(int other) {
     if (other < 0) {
       return -1;
     } else {
       return 0;
     }
   }
   int _shlFromInt(int other) native "Mint_shlFromInt";
 }