[VM] Make us compile with debug-optimization-level=0 again

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 RUNTIME_VM_ISOLATE_H_
 #define RUNTIME_VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/atomic.h"
@@ skipping 265 matching lines @@
   }
 
   void SetupImagePage(const uint8_t* snapshot_buffer, bool is_executable);
 
   void ScheduleMessageInterrupts();
 
   // Marks all libraries as loaded.
   void DoneLoading();
   void DoneFinalizing();
 
+#if !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
   // By default the reload context is deleted. This parameter allows
   // the caller to delete is separately if it is still needed.
   bool ReloadSources(JSONStream* js,
                      bool force_reload,
                      const char* root_script_url = NULL,
                      const char* packages_url = NULL,
                      bool dont_delete_reload_context = false);
+#endif  // !defined(PRODUCT) && !defined(DART_PRECOMPILED_RUNTIME)
 
   bool MakeRunnable();
   void Run();
 
   MessageHandler* message_handler() const { return message_handler_; }
   void set_message_handler(MessageHandler* value) { message_handler_ = value; }
 
   bool is_runnable() const { return IsRunnableBit::decode(isolate_flags_); }
   void set_is_runnable(bool value) {
     isolate_flags_ = IsRunnableBit::update(value, isolate_flags_);
@@ skipping 820 matching lines @@
   intptr_t* spawn_count_;
 
   Dart_IsolateFlags isolate_flags_;
   bool paused_;
   bool errors_are_fatal_;
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_ISOLATE_H_