message: Suppress forward null warning
diff: @@ -1136,6 +1136,7 @@ bool Module::writeBitcode(llvm::Module *module, const char *outFileName, OutputT
  // go. If we open it, it'll be closed by the llvm::raw_fd_ostream
  // destructor.
  int fd;
  + Assert(outFileName);
  if (!strcmp(outFileName, "-"))
  fd = 1; // stdout
  else {
  