Update to the rustfmt in rust 1.31, which is now stable.

lib/codegen/src/timing.rs

@@ -37,7 +37,7 @@ macro_rules! define_passes {
 }
 
 // Pass definitions.
-define_passes!{
+define_passes! {
     Pass, NUM_PASSES, DESCRIPTIONS;
 
     process_file: "Processing test file",
@@ -176,7 +176,7 @@ mod details {
     }
 
     /// Information about passes in a single thread.
-    thread_local!{
+    thread_local! {
         static CURRENT_PASS: Cell<Pass> = Cell::new(Pass::None);
         static PASS_TIME: RefCell<PassTimes> = RefCell::new(Default::default());
     }