remove check from const promotion

Author: cjkenn

compiler/rustc_mir/src/transform/promote_consts.rs

@@ -60,10 +60,6 @@ impl<'tcx> MirPass<'tcx> for PromoteTemps<'tcx> {
             return;
         }
 
-        if !tcx.consider_optimizing(|| format!("PromoteTemps {:?} ", body.source.def_id())) {
-            return;
-        }
-
         let mut rpo = traversal::reverse_postorder(body);
         let ccx = ConstCx::new(tcx, body);
         let (temps, all_candidates) = collect_temps_and_candidates(&ccx, &mut rpo);