Subzero: Fix a warning message in the browser build.

src/IceBrowserCompileServer.cpp

Index: src/IceBrowserCompileServer.cpp
diff --git a/src/IceBrowserCompileServer.cpp b/src/IceBrowserCompileServer.cpp
index 0b622df696561b9215761a7d9a18ebeea97e9803..8b94a977250d1d151b24f4485453d98f6a85e78e 100644
--- a/src/IceBrowserCompileServer.cpp
+++ b/src/IceBrowserCompileServer.cpp
@@ -277,7 +277,9 @@ void BrowserCompileServer::startCompileThread(int ObjFD) {
   InputStream = new llvm::QueueStreamer();
   bool LogStreamFailure = false;
   int LogFD = STDOUT_FILENO;
-  if (getFlags().getLogFilename() == "/dev/stderr") {
+  if (getFlags().getLogFilename() == "-") {
+    // Common case, do nothing.
+  } else if (getFlags().getLogFilename() == "/dev/stderr") {
     LogFD = STDERR_FILENO;
   } else {
     LogStreamFailure = true;