Mini optimization in restrict_precision_for_drop_types

Avoid calling `type_is_copy_modulo_regions` if not necessary.

Author: Jules-Bertholet

compiler/rustc_hir_typeck/src/upvar.rs

@@ -2318,9 +2318,9 @@ fn restrict_precision_for_drop_types<'a, 'tcx>(
     mut place: Place<'tcx>,
     mut curr_mode: ty::UpvarCapture,
 ) -> (Place<'tcx>, ty::UpvarCapture) {
-    let is_copy_type = fcx.infcx.type_is_copy_modulo_regions(fcx.param_env, place.ty());
-
-    if let (false, UpvarCapture::ByValue) = (is_copy_type, curr_mode) {
+    if curr_mode == UpvarCapture::ByValue
+        && !fcx.infcx.type_is_copy_modulo_regions(fcx.param_env, place.ty())
+    {
         for i in 0..place.projections.len() {
             match place.ty_before_projection(i).kind() {
                 ty::Adt(def, _) if def.destructor(fcx.tcx).is_some() => {