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/profiling.rs

@@ -1,9 +1,9 @@
-use crate::source_map::SourceMap;
-
 use std::borrow::Borrow;
 
 use rustc_data_structures::profiling::EventArgRecorder;
 
+use crate::source_map::SourceMap;
+
 /// Extension trait for self-profiling purposes: allows to record spans within a generic activity's
 /// event arguments.
 pub trait SpannedEventArgRecorder {