Fix run-test on host.

Change-Id: I44ebb4cdc2f5966be51a063e3c7256ab3016c404
diff --git a/src/logging_linux.cc b/src/logging_linux.cc
index e781a00..4e7c796 100644
--- a/src/logging_linux.cc
+++ b/src/logging_linux.cc
@@ -34,9 +34,11 @@
 }
 
 void LogMessage::LogLine(const char* message) {
-  std::cerr << "VDIWEFF"[data_->severity] << ' '
-            << StringPrintf("%5d %5d", getpid(), ::art::GetTid()) << ' '
-            << data_->file << ':' << data_->line_number << "] " << message << std::endl;
+  std::ostream &out =
+      (gLogVerbosity.logging_stream == NULL ? std::cerr : *gLogVerbosity.logging_stream);
+  out << "VDIWEFF"[data_->severity] << ' '
+      << StringPrintf("%5d %5d", getpid(), ::art::GetTid()) << ' '
+      << data_->file << ':' << data_->line_number << "] " << message << std::endl;
 }
 
 }  // namespace art