Revert some span_bugs to span_delayed_bug.

Fixes #121410.
Fixes #121414.
Fixes #121418.
Fixes #121431.

compiler/rustc_trait_selection/src/traits/mod.rs

@@ -172,9 +172,7 @@ fn do_normalize_predicates<'tcx>(
     // the normalized predicates.
     let errors = infcx.resolve_regions(&outlives_env);
     if !errors.is_empty() {
-        // @lcnr: Let's still ICE here for now. I want a test case
-        // for that.
-        tcx.dcx().span_bug(
+        tcx.dcx().span_delayed_bug(
             span,
             format!("failed region resolution while normalizing {elaborated_env:?}: {errors:?}"),
         );