ART: Curb dex2oat verbosity

Only print dedupe collisions in a debug build or on verbose logging.

Change-Id: I08bd04a453d95b6dba6cf6955b5741cd97daf480
diff --git a/dex2oat/dex2oat.cc b/dex2oat/dex2oat.cc
index b576ca2..fe3a978 100644
--- a/dex2oat/dex2oat.cc
+++ b/dex2oat/dex2oat.cc
@@ -1640,7 +1640,7 @@
   void LogCompletionTime() {
     LOG(INFO) << "dex2oat took " << PrettyDuration(NanoTime() - start_ns_)
               << " (threads: " << thread_count_ << ") "
-              << driver_->GetMemoryUsageString();
+              << driver_->GetMemoryUsageString(kIsDebugBuild || VLOG_IS_ON(compiler));
   }
 
   std::unique_ptr<CompilerOptions> compiler_options_;