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

runtime/vm/tags.cc

 // Copyright (c) 2014, 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 "vm/tags.h"
 
 #include "vm/isolate.h"
 #include "vm/json_stream.h"
 #include "vm/native_entry.h"
 #include "vm/runtime_entry.h"
@@ skipping 119 matching lines @@
 }
 
 
 int64_t VMTagCounters::count(uword tag) {
   ASSERT(tag != VMTag::kInvalidTagId);
   ASSERT(tag < VMTag::kNumVMTags);
   return counters_[tag];
 }
 
 
+#ifndef PRODUCT
 void VMTagCounters::PrintToJSONObject(JSONObject* obj) {
   if (!FLAG_support_service) {
     return;
   }
   {
     JSONArray arr(obj, "names");
     for (intptr_t i = 1; i < VMTag::kNumVMTags; i++) {
       arr.AddValue(VMTag::TagName(i));
     }
   }
   {
     JSONArray arr(obj, "counters");
     for (intptr_t i = 1; i < VMTag::kNumVMTags; i++) {
       arr.AddValue64(counters_[i]);
     }
   }
 }
+#endif  // !PRODUCT
 
 
 const char* UserTags::TagName(uword tag_id) {
   ASSERT(tag_id >= kUserTagIdOffset);
   ASSERT(tag_id < kUserTagIdOffset + kMaxUserTags);
   Zone* zone = Thread::Current()->zone();
   const UserTag& tag =
       UserTag::Handle(zone, UserTag::FindTagById(tag_id));
   ASSERT(!tag.IsNull());
   const String& label = String::Handle(zone, tag.label());
   return label.ToCString();
 }
 
 
 }  // namespace dart