Function rustc_incremental::persist::fs::in_incr_comp_dir

pub fn in_incr_comp_dir(incr_comp_session_dir: &Path, file_name: &str) -> PathBuf

Returns the path for a given filename within the incremental compilation directory, not necessarily from the current session.

To ensure the file is part of the current session, use in_incr_comp_dir_sess.