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_mir_transform/src/coverage/graph.rs

@@ -1,3 +1,7 @@
+use std::cmp::Ordering;
+use std::collections::VecDeque;
+use std::ops::{Index, IndexMut};
+
 use rustc_data_structures::captures::Captures;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_data_structures::graph::dominators::{self, Dominators};
@@ -7,10 +11,6 @@ use rustc_index::IndexVec;
 use rustc_middle::bug;
 use rustc_middle::mir::{self, BasicBlock, Terminator, TerminatorKind};
 
-use std::cmp::Ordering;
-use std::collections::VecDeque;
-use std::ops::{Index, IndexMut};
-
 /// A coverage-specific simplification of the MIR control flow graph (CFG). The `CoverageGraph`s
 /// nodes are `BasicCoverageBlock`s, which encompass one or more MIR `BasicBlock`s.
 #[derive(Debug)]

compiler/rustc_mir_transform/src/coverage/mod.rs

@@ -147,7 +147,8 @@ fn create_mappings<'tcx>(
 
     let source_file = source_map.lookup_source_file(body_span.lo());
 
-    use rustc_session::{config::RemapPathScopeComponents, RemapFileNameExt};
+    use rustc_session::config::RemapPathScopeComponents;
+    use rustc_session::RemapFileNameExt;
     let file_name = Symbol::intern(
         &source_file.name.for_scope(tcx.sess, RemapPathScopeComponents::MACRO).to_string_lossy(),
     );

compiler/rustc_mir_transform/src/coverage/spans.rs

@@ -6,11 +6,10 @@ use rustc_middle::mir;
 use rustc_span::Span;
 
 use crate::coverage::graph::{BasicCoverageBlock, CoverageGraph};
-use crate::coverage::mappings;
 use crate::coverage::spans::from_mir::{
     extract_covspans_from_mir, ExtractedCovspans, Hole, SpanFromMir,
 };
-use crate::coverage::ExtractedHirInfo;
+use crate::coverage::{mappings, ExtractedHirInfo};
 
 mod from_mir;
 

compiler/rustc_mir_transform/src/coverage/tests.rs

@@ -24,16 +24,15 @@
 //! globals is comparatively simpler. The easiest way is to wrap the test in a closure argument
 //! to: `rustc_span::create_default_session_globals_then(|| { test_here(); })`.
 
-use super::graph::{self, BasicCoverageBlock};
-
 use itertools::Itertools;
 use rustc_data_structures::graph::{DirectedGraph, Successors};
 use rustc_index::{Idx, IndexVec};
-use rustc_middle::bug;
 use rustc_middle::mir::*;
-use rustc_middle::ty;
+use rustc_middle::{bug, ty};
 use rustc_span::{BytePos, Pos, Span, DUMMY_SP};
 
+use super::graph::{self, BasicCoverageBlock};
+
 fn bcb(index: u32) -> BasicCoverageBlock {
     BasicCoverageBlock::from_u32(index)
 }