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_pattern_analysis/src/pat.rs

@@ -5,11 +5,10 @@ use std::fmt;
 
 use smallvec::{smallvec, SmallVec};
 
+use self::Constructor::*;
 use crate::constructor::{Constructor, Slice, SliceKind};
 use crate::{PatCx, PrivateUninhabitedField};
 
-use self::Constructor::*;
-
 /// A globally unique id to distinguish patterns.
 #[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub(crate) struct PatId(u32);