With --noopt run unoptimized code through optimizer, more optimizations can be done later.

runtime/vm/compiler.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_COMPILER_H_
 #define VM_COMPILER_H_
 
 #include "vm/allocation.h"
 #include "vm/growable_array.h"
 #include "vm/runtime_entry.h"
@@ skipping 63 matching lines @@
   static RawObject* EvaluateStaticInitializer(const Field& field);
 
   // Generates local var descriptors and sets it in 'code'. Do not call if the
   // local var descriptor already exists.
   static void ComputeLocalVarDescriptors(const Code& code);
 
   // Eagerly compiles all functions in a class.
   //
   // Returns Error::null() if there is no compilation error.
   static RawError* CompileAllFunctions(const Class& cls);
+
+  // The following global flags are changed by --noopt handler;
+  // the flags are changed when generating best unoptimized code (no runtime
+  // feedback, no deoptimization).
+
+  // Default: false.
+  static bool always_optimize() { return always_optimize_; }
+  static void set_always_optimize(bool value) { always_optimize_ = value; }
+
+  // Default: true.
+  static bool guess_other_cid() { return guess_other_cid_; }
+  static void set_guess_other_cid(bool value) { guess_other_cid_ = value; }
+
+ private:
+  static bool always_optimize_;
+  static bool guess_other_cid_;
 };
 
 }  // namespace dart
 
 #endif  // VM_COMPILER_H_