change snapshot tracking in fulfillment contexts

compiler/rustc_trait_selection/src/traits/query/evaluate_obligation.rs

@@ -80,7 +80,7 @@ impl<'tcx> InferCtxtExt<'tcx> for InferCtxt<'tcx> {
 
         if self.next_trait_solver() {
             self.probe(|snapshot| {
-                let mut fulfill_cx = crate::solve::FulfillmentCtxt::new();
+                let mut fulfill_cx = crate::solve::FulfillmentCtxt::new(self);
                 fulfill_cx.register_predicate_obligation(self, obligation.clone());
                 // True errors
                 // FIXME(-Ztrait-solver=next): Overflows are reported as ambig here, is that OK?

compiler/rustc_trait_selection/src/traits/query/type_op/custom.rs

@@ -82,7 +82,7 @@ where
     );
 
     let value = infcx.commit_if_ok(|_| {
-        let ocx = ObligationCtxt::new_in_snapshot(infcx);
+        let ocx = ObligationCtxt::new(infcx);
         let value = op(&ocx).map_err(|_| {
             infcx.tcx.sess.delay_span_bug(span, format!("error performing operation: {name}"))
         })?;