Revert "- Use a hash table to canonicalize instances/arrays to avoid having to iterate over a linea…

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/dart_entry.h"
 #include "vm/dart_api_impl.h"
 #include "vm/exceptions.h"
@@ skipping 226 matching lines @@
   GET_NATIVE_ARGUMENT(Integer, default_value, arguments->NativeArgAt(2));
   // Call the embedder to supply us with the environment.
   const String& env_value =
       String::Handle(Api::GetEnvironmentValue(thread, name));
   if (!env_value.IsNull()) {
     const Integer& result = Integer::Handle(ParseInteger(env_value));
     if (!result.IsNull()) {
       if (result.IsSmi()) {
         return result.raw();
       }
-      return result.CheckAndCanonicalize(thread, NULL);
+      return result.CheckAndCanonicalize(NULL);
     }
   }
   return default_value.raw();
 }
 
 
 static RawInteger* ShiftOperationHelper(Token::Kind kind,
                                         const Integer& value,
                                         const Smi& amount) {
   if (amount.Value() < 0) {
@@ skipping 166 matching lines @@
 DEFINE_NATIVE_ENTRY(Bigint_allocate, 4) {
   // First arg is null type arguments, since class Bigint is not parameterized.
   const Bool& neg = Bool::CheckedHandle(arguments->NativeArgAt(1));
   const Smi& used = Smi::CheckedHandle(arguments->NativeArgAt(2));
   const TypedData& digits = TypedData::CheckedHandle(arguments->NativeArgAt(3));
   ASSERT(!digits.IsNull());
   return Bigint::New(neg.value(), used.Value(), digits);
 }
 
 }  // namespace dart