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_codegen_gcc/src/common.rs

@@ -1,5 +1,4 @@
-use gccjit::LValue;
-use gccjit::{RValue, ToRValue, Type};
+use gccjit::{LValue, RValue, ToRValue, Type};
 use rustc_codegen_ssa::traits::{BaseTypeMethods, ConstMethods, MiscMethods, StaticMethods};
 use rustc_middle::mir::interpret::{ConstAllocation, GlobalAlloc, Scalar};
 use rustc_middle::mir::Mutability;