More changes to use #ifndef PRODUCT ... #endif explicitly instead of relying on compiler magic.

runtime/vm/flags.h

-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// 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_FLAGS_H_
 #define VM_FLAGS_H_
 
 #include "platform/assert.h"
 #include "vm/flag_list.h"
 #include "vm/globals.h"
 
@@ skipping 48 matching lines @@
                             const char* comment);
 
   static bool ProcessCommandLineFlags(int argc, const char** argv);
 
   static Flag* Lookup(const char* name);
 
   static bool IsSet(const char* name);
 
   static bool Initialized() { return initialized_; }
 
+#ifndef PRODUCT
   static void PrintJSON(JSONStream* js);
+#endif  // !PRODUCT
 
   static bool SetFlag(const char* name,
                       const char* value,
                       const char** error);
 
  private:
   static Flag** flags_;
   static intptr_t capacity_;
   static intptr_t num_flags_;
 
   static bool initialized_;
 
   static void AddFlag(Flag* flag);
 
   static bool SetFlagFromString(Flag* flag, const char* argument);
 
   static void Parse(const char* option);
 
   static int CompareFlagNames(const void* left, const void* right);
 
   static void PrintFlags();
 
+#ifndef PRODUCT
   static void PrintFlagToJSONArray(JSONArray* jsarr, const Flag* flag);
+#endif  // !PRODUCT
 
   // Testing needs direct access to private methods.
   friend void Dart_TestParseFlags();
 
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(Flags);
 };
 
 #define PRODUCT_FLAG_MARCO(name, type, default_value, comment) \
   extern type FLAG_##name;
@@ skipping 43 matching lines @@
           PRECOMPILE_FLAG_MARCO)
 
 #undef RELEASE_FLAG_MARCO
 #undef DEBUG_FLAG_MARCO
 #undef PRODUCT_FLAG_MARCO
 #undef PRECOMPILE_FLAG_MARCO
 
 }  // namespace dart
 
 #endif  // VM_FLAGS_H_