Make --noopt behave like an in-place precompilation.

runtime/vm/dart_api_impl.cc

 // Copyright (c) 2013, 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 "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
 #include "vm/class_finalizer.h"
@@ skipping 5932 matching lines @@
   TimelineEvent* event = stream->StartEvent();
   if (event != NULL) {
     event->AsyncEnd(label, async_id);
     event->Complete();
   }
   return Api::Success();
 }
 
 
 DART_EXPORT Dart_Handle Dart_Precompile(
-    Dart_QualifiedFunctionName entry_points[]) {
+    Dart_QualifiedFunctionName entry_points[],
+    bool reset_fields) {
   DARTSCOPE(Thread::Current());
   Dart_Handle result = Api::CheckAndFinalizePendingClasses(I);
   if (::Dart_IsError(result)) {
     return result;
   }
   CHECK_CALLBACK_STATE(I);
-  const Error& error = Error::Handle(Precompiler::CompileAll(entry_points));
+  const Error& error = Error::Handle(Precompiler::CompileAll(entry_points,
+                                                             reset_fields));
   if (!error.IsNull()) {
     return Api::NewHandle(I, error.raw());
   }
   return Api::Success();
 }
 
 
 DART_EXPORT Dart_Handle Dart_CreatePrecompiledSnapshot(
     uint8_t** vm_isolate_snapshot_buffer,
     intptr_t* vm_isolate_snapshot_size,
@@ skipping 33 matching lines @@
                                    ApiReallocate);
   writer.WriteFullSnapshot();
   *vm_isolate_snapshot_size = writer.VmIsolateSnapshotSize();
   *isolate_snapshot_size = writer.IsolateSnapshotSize();
   *instructions_snapshot_size = writer.InstructionsSnapshotSize();
 
   return Api::Success();
 }
 
 }  // namespace dart