- Convert all isolate flags to a bit field.

runtime/vm/benchmark_test.cc

Index: runtime/vm/benchmark_test.cc
diff --git a/runtime/vm/benchmark_test.cc b/runtime/vm/benchmark_test.cc
index 3bf9058478edf268b9d3dfa8d0e033127d477804..1161c6799692b598dc4e7cb3337b1de576ce52d4 100644
--- a/runtime/vm/benchmark_test.cc
+++ b/runtime/vm/benchmark_test.cc
@@ -21,6 +21,8 @@ using dart::bin::File;
 
 namespace dart {
 
+DECLARE_FLAG(bool, use_dart_frontend);
+
 Benchmark* Benchmark::first_ = NULL;
 Benchmark* Benchmark::tail_ = NULL;
 const char* Benchmark::executable_ = NULL;
@@ -92,8 +94,11 @@ void Benchmark::RunAll(const char* executable) {
 Dart_Isolate Benchmark::CreateIsolate(const uint8_t* snapshot_data,
                                       const uint8_t* snapshot_instructions) {
   char* err = NULL;
+  Dart_IsolateFlags api_flags;
+  Isolate::FlagsInitialize(&api_flags);
+  api_flags.use_dart_frontend = FLAG_use_dart_frontend;
   isolate_ = Dart_CreateIsolate(NULL, NULL, snapshot_data,
-                                snapshot_instructions, NULL, NULL, &err);
+                                snapshot_instructions, &api_flags, NULL, &err);
   EXPECT(isolate_ != NULL);
   free(err);
   return isolate_;