incr.comp.: Fix some merge fallout.

src/librustc/ty/maps/plumbing.rs

@@ -651,7 +651,7 @@ pub fn force_from_dep_node<'a, 'gcx, 'lcx>(tcx: TyCtxt<'a, 'gcx, 'lcx>,
 
                 profq_msg!(tcx,
                     ProfileQueriesMsg::QueryBegin(
-                        span.clone(),
+                        span.data(),
                         ::ty::maps::QueryMsg::$query(profq_key!(tcx, $key))
                     )
                 );

src/librustc_incremental/persist/load.rs

@@ -33,6 +33,13 @@ pub fn dep_graph_tcx_init<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
     tcx.allocate_metadata_dep_nodes();
     tcx.precompute_in_scope_traits_hashes();
 
+    if tcx.sess.incr_comp_session_dir_opt().is_none() {
+        // If we are only building with -Zquery-dep-graph but without an actual
+        // incr. comp. session directory, we exit here. Otherwise we'd fail
+        // when trying to load work products.
+        return
+    }
+
     let work_products_path = work_products_path(tcx.sess);
     if let Some(work_products_data) = load_data(tcx.sess, &work_products_path) {
         // Decode the list of work_products

src/librustc_trans/base.rs

@@ -956,8 +956,6 @@ pub fn trans_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
         }
     }
 
-    assert!(codegen_units.len() <= 1 || !tcx.sess.lto());
-
     let ongoing_translation = write::start_async_translation(
         tcx,
         time_graph.clone(),