Reformat use declarations.

The previous commit updated `rustfmt.toml` appropriately. This commit is
the outcome of running `x fmt --all` with the new formatting options.

compiler/rustc_data_structures/src/sync.rs

@@ -41,10 +41,11 @@
 //!
 //! [^2]: `MTRef`, `MTLockRef` are type aliases.
 
-pub use crate::marker::*;
 use std::collections::HashMap;
 use std::hash::{BuildHasher, Hash};
 
+pub use crate::marker::*;
+
 mod lock;
 #[doc(no_inline)]
 pub use lock::{Lock, LockGuard, Mode};
@@ -56,7 +57,6 @@ mod parallel;
 #[cfg(parallel_compiler)]
 pub use parallel::scope;
 pub use parallel::{join, par_for_each_in, par_map, parallel_guard, try_par_for_each_in};
-
 pub use vec::{AppendOnlyIndexVec, AppendOnlyVec};
 
 mod vec;