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_span/src/caching_source_map_view.rs

@@ -1,7 +1,9 @@
+use std::ops::Range;
+
+use rustc_data_structures::sync::Lrc;
+
 use crate::source_map::SourceMap;
 use crate::{BytePos, Pos, RelativeBytePos, SourceFile, SpanData};
-use rustc_data_structures::sync::Lrc;
-use std::ops::Range;
 
 #[derive(Clone)]
 struct CacheEntry {