message: Don't hardcode /tmp for shorten-srcstrings map path
  Summary:
  This always spews a warning unless a config is specified for
  ShortenSrcStrings, since we try to prepend the global output path.  (Also,
  hardcoding /tmp is just bad).
diff: @@ -18,7 +18,7 @@ class ShortenSrcStringsPass : public Pass {
  virtual void configure_pass(const PassConfig& pc) override {
  pc.get(
  "filename_mappings",
  - "/tmp/filename_mappings.txt",
  + "filename_mappings.txt",
  m_filename_mappings);
  }
  