Fix ICE

src/librustc_trans_utils/trans_crate.rs

@@ -26,6 +26,7 @@ use std::io::prelude::*;
 use std::io::{self, Cursor};
 use std::fs::File;
 use std::path::Path;
+use std::rc::Rc;
 use std::sync::mpsc;
 
 use rustc_data_structures::owning_ref::{ErasedBoxRef, OwningRef};
@@ -191,6 +192,9 @@ impl TransCrate for MetadataOnlyTransCrate {
 
     fn provide(&self, providers: &mut Providers) {
         ::symbol_names::provide(providers);
+        providers.target_features_enabled = |_tcx, _id| {
+            Rc::new(Vec::new()) // Just a dummy
+        };
     }
     fn provide_extern(&self, _providers: &mut Providers) {}