Make --emit=metadata output metadata regardless of link

src/librustc_trans/back/link.rs

@@ -146,9 +146,7 @@ pub(crate) fn link_binary(sess: &Session,
     let mut out_filenames = Vec::new();
     for &crate_type in sess.crate_types.borrow().iter() {
         // Ignore executable crates if we have -Z no-trans, as they will error.
-        if (sess.opts.debugging_opts.no_trans ||
-            !sess.opts.output_types.should_trans()) &&
-           crate_type == config::CrateTypeExecutable {
+        if sess.opts.debugging_opts.no_trans && crate_type == config::CrateTypeExecutable {
             continue;
         }