Handle failure in the Driver's getTemporaryFilePath helper

const char *
ToolChain::JobContext::getTemporaryFilePath(const llvm::Twine &name,
                                            StringRef suffix) const {
  SmallString<128> buffer;
  std::error_code EC = llvm::sys::fs::createTemporaryFile(name, suffix, buffer);
  if (EC) {
    // FIXME: This should not take down the entire process.
    llvm::report_fatal_error("unable to create temporary file for filelist");
  }

  C.addTemporaryFile(buffer.str(), PreserveOnSignal::Yes);
  // We can't just reference the data in the TemporaryFiles vector because
  // that could theoretically get copied to a new address.
  return C.getArgs().MakeArgString(buffer.str());
}