Fix ICE on invalid const param types

compiler/rustc_hir_analysis/src/collect.rs

@@ -386,6 +386,8 @@ impl<'tcx> HirTyLowerer<'tcx> for ItemCtxt<'tcx> {
 
     fn ct_infer(&self, ty: Ty<'tcx>, _: Option<&ty::GenericParamDef>, span: Span) -> Const<'tcx> {
         let ty = self.tcx.fold_regions(ty, |r, _| match *r {
+            rustc_type_ir::RegionKind::ReStatic => r,
+
             // This is never reached in practice. If it ever is reached,
             // `ReErased` should be changed to `ReStatic`, and any other region
             // left alone.