Lookup getter/setter symbols before alllocating them, thus eliminating extra String allocations in …

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 243 matching lines @@
 // Passing true for 'silent' prevents throwing JavascriptIntegerOverflow.
 static RawInteger* ShiftOperationHelper(Token::Kind kind,
                                         const Integer& value,
                                         const Smi& amount,
                                         const bool silent = false) {
   if (amount.Value() < 0) {
     Exceptions::ThrowArgumentError(amount);
   }
   if (value.IsSmi()) {
     const Smi& smi_value = Smi::Cast(value);
-    return smi_value.ShiftOp(kind, amount, silent);
+    return smi_value.ShiftOp(kind, amount, Heap::kNew, silent);
   }
   if (value.IsMint()) {
     const int64_t mint_value = value.AsInt64Value();
     const int count = Utils::HighestBit(mint_value);
     intptr_t shift_count = amount.Value();
     if (kind == Token::kSHR) {
       shift_count = -shift_count;
     }
     if ((count + shift_count) < Mint::kBits) {
       switch (kind) {
@@ skipping 149 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