Adjust check-cfg get_many_mut usage following API change

Author: Urgau

compiler/rustc_session/src/config/cfg.rs

@@ -402,18 +402,18 @@ impl CheckCfg {
                 // Get all values map at once otherwise it would be costly.
                 // (8 values * 220 targets ~= 1760 times, at the time of writing this comment).
                 let [
-                    values_target_abi,
-                    values_target_arch,
-                    values_target_endian,
-                    values_target_env,
-                    values_target_family,
-                    values_target_os,
-                    values_target_pointer_width,
-                    values_target_vendor,
-                ] = self
-                    .expecteds
-                    .get_many_mut(VALUES)
-                    .expect("unable to get all the check-cfg values buckets");
+                    Some(values_target_abi),
+                    Some(values_target_arch),
+                    Some(values_target_endian),
+                    Some(values_target_env),
+                    Some(values_target_family),
+                    Some(values_target_os),
+                    Some(values_target_pointer_width),
+                    Some(values_target_vendor),
+                ] = self.expecteds.get_many_mut(VALUES)
+                else {
+                    panic!("unable to get all the check-cfg values buckets");
+                };
 
                 for target in TARGETS
                     .iter()