Rollup merge of #128020 - compiler-errors:nlb-no-const, r=BoxyUwU

Just totally fully deny late-bound consts

Kinda don't care about supporting this until we have where clauses on binders. They're super busted and should be reworked in due time, and they are approximately 100% useless until then 😸

Fixes #127970
Fixes #127009

r? ``@BoxyUwU``

compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs

@@ -2094,11 +2094,7 @@ pub fn deny_non_region_late_bound(
             format!("late-bound {what} parameter not allowed on {where_}"),
         );
 
-        let guar = if tcx.features().non_lifetime_binders && first {
-            diag.emit()
-        } else {
-            diag.delay_as_bug()
-        };
+        let guar = diag.emit_unless(!tcx.features().non_lifetime_binders || !first);
 
         first = false;
         *arg = ResolvedArg::Error(guar);