If true, a shortname for the target platform is used in the output directory name instead of the CPU. The exact scheme is experimental and subject to change: First, in the rare case the --platforms option does not have exactly one value, a hash of the platforms option is used. Next, if any shortname for the current platform was registered by -- experimental_override_name_platform_in_output_dir, then that shortname is used. Then, if --experimental_use_platforms_in_output_dir_legacy_heuristic is set, use a shortname based off the current platform Label. Finally, a hash of the platform option is used as a last resort.