Unfortunately I couldn't find a way to trigger this code, but a simple inspection reveals that if it ever got called it could not complete:

{
      char* dyldpath = getenv("DYLD_LIBRARY_PATH");
      char* dypath = strtok(dyldpath, ":");
      while (dypath != NULL) {
        strcpy(filepath, dypath);
        strcat(filepath, filename);
        if (exists(filepath)) {
           strcpy(rpath, filepath);
           return true;
        }
        dypath = strtok(dyldpath, ":");
      }

This code has been in since support for macOS core files was introduced, and survived this long so it's unlikely it was ever executed.