Update to rustfmt-preview (#348)

* Update to rustfmt-preview.

* Run "cargo fmt --all" with rustfmt 0.4.1.

rustfmt 0.4.1 is the latest release of rustfmt-preview available on the
stable channel.

* Fix a long line that rustfmt 0.4.1 can't handle.

* Remove unneeded commas left behind by rustfmt.

lib/codegen/src/verifier/liveness.rs

@@ -127,8 +127,8 @@ impl<'a> LivenessVerifier<'a> {
         let ctx = self.liveness.context(&self.func.layout);
 
         // Check if `inst` is in the def range, not including the def itself.
-        if ctx.order.cmp(lr.def(), inst) == Ordering::Less &&
-            ctx.order.cmp(inst, lr.def_local_end()) != Ordering::Greater
+        if ctx.order.cmp(lr.def(), inst) == Ordering::Less
+            && ctx.order.cmp(inst, lr.def_local_end()) != Ordering::Greater
         {
             return true;
         }