Fix ICE with save-analysis

Author: JohnTitor

src/librustc_save_analysis/dump_visitor.rs

@@ -866,8 +866,8 @@ impl<'l, 'tcx> DumpVisitor<'l, 'tcx> {
                 // FIXME do something with _path?
                 let hir_id = self.tcx.hir().node_to_hir_id(p.id);
                 let adt = match self.save_ctxt.tables.node_type_opt(hir_id) {
-                    Some(ty) => ty.ty_adt_def().unwrap(),
-                    None => {
+                    Some(ty) if ty.ty_adt_def().is_some() => ty.ty_adt_def().unwrap(),
+                    _ => {
                         visit::walk_pat(self, p);
                         return;
                     }

src/test/ui/issues/issue-26459.rs

@@ -1,3 +1,5 @@
+// compile-flags: -Zsave-analysis
+
 fn main() {
     match 'a' {
         char{ch} => true

src/test/ui/issues/issue-26459.stderr

@@ -1,5 +1,5 @@
 error[E0574]: expected struct, variant or union type, found builtin type `char`
-  --> $DIR/issue-26459.rs:3:9
+  --> $DIR/issue-26459.rs:5:9
    |
 LL |         char{ch} => true
    |         ^^^^ not a struct, variant or union type