Fix LLVM error with tuple struct match using (..)

Consider PatEnums constructed with A(..) to be candidates for tuple
struct patterns, not just ones constructed with A(a,b,c). If these
patterns shouldn't be valid tuple struct patterns (as they're equivalent
to _), this needs to be caught before we get to trans.

Fixes #14308.

Author: lilyball

src/librustc/middle/trans/_match.rs

@@ -1120,7 +1120,7 @@ fn any_tuple_struct_pat(bcx: &Block, m: &[Match], col: uint) -> bool {
     m.iter().any(|br| {
         let pat = *br.pats.get(col);
         match pat.node {
-            ast::PatEnum(_, Some(_)) => {
+            ast::PatEnum(_, _) => {
                 match bcx.tcx().def_map.borrow().find(&pat.id) {
                     Some(&ast::DefFn(..)) |
                     Some(&ast::DefStruct(..)) => true,