Do not override (lower) the VM's code heap size for benchmarks tests.

runtime/vm/benchmark_test.h

 // 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.
 
 #ifndef VM_BENCHMARK_TEST_H_
 #define VM_BENCHMARK_TEST_H_
 
 #include "include/dart_api.h"
 
 #include "vm/dart.h"
 #include "vm/globals.h"
 #include "vm/heap.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/zone.h"
 
 namespace dart {
 
 DECLARE_FLAG(int, code_heap_size);
 DECLARE_FLAG(int, heap_growth_space_ratio);
 
 // The BENCHMARK macro is used for benchmarking a specific functionality
 // of the VM
 #define BENCHMARK(name)                                                        \
   void Dart_Benchmark##name(Benchmark* benchmark);                             \
   static const Benchmark kRegister##name(Dart_Benchmark##name, #name);         \
   static void Dart_BenchmarkHelper##name(Benchmark* benchmark);                \
   void Dart_Benchmark##name(Benchmark* benchmark) {                            \
     FLAG_heap_growth_space_ratio = 100;                                        \
-    FLAG_code_heap_size = 12;                                                  \
     BenchmarkIsolateScope __isolate__(benchmark);                              \
     Zone __zone__(benchmark->isolate());                                       \
     HandleScope __hs__(benchmark->isolate());                                  \
     Dart_BenchmarkHelper##name(benchmark);                                     \
   }                                                                            \
   static void Dart_BenchmarkHelper##name(Benchmark* benchmark)
 
 
 class Benchmark {
  public:
@@ skipping 65 matching lines @@
 
  private:
   Benchmark* benchmark_;
 
   DISALLOW_COPY_AND_ASSIGN(BenchmarkIsolateScope);
 };
 
 }  // namespace dart
 
 #endif  // VM_BENCHMARK_TEST_H_