Fix issue 5275: The VM must always generate the most compact form of an integer (Smi, Mint or Bigin…

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 10572 matching lines @@
   switch (kind) {
     case Token::kSHL: {
       if ((left_value == 0) || (right_value == 0)) {
         return raw();
       }
       { // Check for overflow.
         int cnt = Utils::HighestBit(left_value);
         if ((cnt + right_value) >= Smi::kBits) {
           if ((cnt + right_value) >= Mint::kBits) {
             return BigintOperations::ShiftLeft(
-                Bigint::Handle(AsBigint()), right_value);
+                Bigint::Handle(BigintOperations::NewFromSmi(*this)),
+                               right_value);
           } else {
             int64_t left_64 = left_value;
             return Integer::New(left_64 << right_value);
           }
         }
       }
       result = left_value << right_value;
       break;
     }
     case Token::kSHR: {
@@ skipping 2651 matching lines @@
   }
   return result.raw();
 }
 
 
 const char* WeakProperty::ToCString() const {
   return "_WeakProperty";
 }
 
 }  // namespace dart