Remove many features when building product mode

runtime/vm/isolate.h

 // 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.
 
 #ifndef VM_ISOLATE_H_
 #define VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/atomic.h"
@@ skipping 286 matching lines @@
 
   bool is_runnable() const { return is_runnable_; }
   void set_is_runnable(bool value) { is_runnable_ = value; }
 
   IsolateSpawnState* spawn_state() const { return spawn_state_; }
   void set_spawn_state(IsolateSpawnState* value) { spawn_state_ = value; }
 
   Mutex* mutex() const { return mutex_; }
 
   Debugger* debugger() const {
+    if (!FLAG_support_debugger) {
+      return NULL;
+    }
     ASSERT(debugger_ != NULL);
     return debugger_;
   }
 
   void set_single_step(bool value) { single_step_ = value; }
   bool single_step() const { return single_step_; }
   static intptr_t single_step_offset() {
     return OFFSET_OF(Isolate, single_step_);
   }
 
@@ skipping 674 matching lines @@
   intptr_t* spawn_count_;
 
   Isolate::Flags isolate_flags_;
   bool paused_;
   bool errors_are_fatal_;
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_