message: Remove LibSource
  The information is stored in used_crate_source too anyway
diff: @@ -185,7 +185,7 @@ fn load_imported_symbols_for_jit(tcx: TyCtxt<'_>) -> Vec<(String, *const u8)> {
  .find(|(crate_type, _data)| *crate_type == rustc_session::config::CrateType::Executable)
  .unwrap()
  .1;
  - for &(cnum, _) in &crate_info.used_crates_dynamic {
  + for &cnum in &crate_info.used_crates {
  let src = &crate_info.used_crate_source[&cnum];
  match data[cnum.as_usize() - 1] {
  Linkage::NotLinked | Linkage::IncludedFromDylib => {}
  