use field init shorthand in src/librustc

The field init shorthand syntax was stabilized in 1.17.0 (aebd94f); we
are now free to use it in the compiler.

Author: zackmdavis

src/librustc/cfg/construct.rs

@@ -58,20 +58,20 @@ pub fn construct<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
     let tables = tcx.typeck_tables_of(owner_def_id);
 
     let mut cfg_builder = CFGBuilder {
-        tcx: tcx,
+        tcx,
         owner_def_id,
-        tables: tables,
-        graph: graph,
-        fn_exit: fn_exit,
+        tables,
+        graph,
+        fn_exit,
         loop_scopes: Vec::new(),
         breakable_block_scopes: Vec::new(),
     };
     body_exit = cfg_builder.expr(&body.value, entry);
     cfg_builder.add_contained_edge(body_exit, fn_exit);
     let CFGBuilder { graph, .. } = cfg_builder;
     CFG {
-        graph: graph,
-        entry: entry,
+        graph,
+        entry,
         exit: fn_exit,
     }
 }

src/librustc/dep_graph/dep_tracking_map.rs

@@ -36,7 +36,7 @@ impl<M: DepTrackingMapConfig> DepTrackingMap<M> {
     pub fn new(graph: DepGraph) -> DepTrackingMap<M> {
         DepTrackingMap {
             phantom: PhantomData,
-            graph: graph,
+            graph,
             map: FxHashMap(),
         }
     }