Fix wrong conversion from double to bigint in overriden operators of new bigint.

runtime/vm/object.cc

 // 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.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 16810 matching lines @@
     UNREACHABLE();
   }
   const int64_t bit_len = used * kBitsPerDigit;
   const int64_t dec_len = (bit_len * kLog2Dividend / kLog2Divisor) + 1;
   // Add one byte for the minus sign and for the trailing \0 character.
   const int64_t len = (Neg() ? 1 : 0) + dec_len + 1;
   char* chars = reinterpret_cast<char*>(allocator(len));
   intptr_t pos = 0;
   const intptr_t kDivisor = 100000000;
   const intptr_t kDigits = 8;
-  // TODO(regis): Fix Windows error reported for ambiguous call to 'pow'.
-  // ASSERT(pow(10.0, kDigits) == kDivisor);
+  ASSERT(pow(10.0, 1.0 * kDigits) == kDivisor);
   ASSERT(kDivisor < kDigitBase);
   ASSERT(Smi::IsValid(kDivisor));
   // Allocate a copy of the digits.
   const TypedData& rest_digits = TypedData::Handle(
       TypedData::New(kTypedDataUint32ArrayCid, used));
   for (intptr_t i = 0; i < used; i++) {
     rest_digits.SetUint32(i << 2, DigitAt(i));
   }
   if (used == 0) {
     chars[pos++] = '0';
@@ skipping 3520 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart