Use range information for optimizing integer boxing and fix bug in range analysis.

runtime/lib/integers.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/bootstrap_natives.h"
 
 #include "include/dart_api.h"
 #include "vm/bigint_operations.h"
 #include "vm/dart_entry.h"
 #include "vm/dart_api_impl.h"
@@ skipping 14 matching lines @@
 // Returns false if integer is in wrong representation, e.g., as is a Bigint
 // when it could have been a Smi.
 static bool CheckInteger(const Integer& i) {
   if (i.IsBigint()) {
     const Bigint& bigint = Bigint::Cast(i);
     return !BigintOperations::FitsIntoSmi(bigint) &&
         !BigintOperations::FitsIntoInt64(bigint);
   }
   if (i.IsMint()) {
     const Mint& mint = Mint::Cast(i);
-    return !Smi::IsValid64(mint.value());
+    return !Smi::IsValid(mint.value());
   }
   return true;
 }
 
 
 static int BitLengthInt64(int64_t value) {
   value ^= value >> (8 * sizeof(value) - 1);  // flip bits if negative.
   return value == 0 ? 0 : Utils::HighestBit(value) + 1;
 }
 
@@ skipping 395 matching lines @@
   // Use the preallocated out of memory exception to avoid calling
   // into dart code or allocating any code.
   const Instance& exception =
       Instance::Handle(isolate->object_store()->out_of_memory());
   Exceptions::Throw(isolate, exception);
   UNREACHABLE();
   return 0;
 }
 
 }  // namespace dart