Auto merge of #125443 - nnethercote:rustfmt-use-decls, r=lcnr,cuviper,GuillaumeGomez

rustfmt `use` declarations

This PR implements https://github.com/rust-lang/compiler-team/issues/750, which changes how `use` declarations are formatted by adding these options to `rustfmt.toml`:
```
group_imports = "StdExternalCrate"
imports_granularity = "Module"
```

r? `@ghost`

1 files changed, 4 insertions, 3 deletions

diff --git a/compiler/rustc_data_structures/src/sync/parallel.rs b/compiler/rustc_data_structures/src/sync/parallel.rs
index 7783de57fba..2b89431c2ed 100644
--- a/compiler/rustc_data_structures/src/sync/parallel.rs
+++ b/compiler/rustc_data_structures/src/sync/parallel.rs
@@ -3,9 +3,6 @@
 
 #![allow(dead_code)]
 
-use crate::sync::IntoDynSyncSend;
-use crate::FatalErrorMarker;
-use parking_lot::Mutex;
 use std::any::Any;
 use std::panic::{catch_unwind, resume_unwind, AssertUnwindSafe};
 
@@ -13,6 +10,10 @@ use std::panic::{catch_unwind, resume_unwind, AssertUnwindSafe};
 pub use disabled::*;
 #[cfg(parallel_compiler)]
 pub use enabled::*;
+use parking_lot::Mutex;
+
+use crate::sync::IntoDynSyncSend;
+use crate::FatalErrorMarker;
 
 /// A guard used to hold panics that occur during a parallel section to later by unwound.
 /// This is used for the parallel compiler to prevent fatal errors from non-deterministically