cleanup: unnecessary clone during lower generics args

Author: bvanjoi

compiler/rustc_hir_analysis/src/hir_ty_lowering/generics.rs

@@ -228,8 +228,8 @@ pub fn lower_generic_args<'tcx: 'a, 'a>(
         // Check whether this segment takes generic arguments and the user has provided any.
         let (generic_args, infer_args) = ctx.args_for_def_id(def_id);
 
-        let args_iter = generic_args.iter().flat_map(|generic_args| generic_args.args.iter());
-        let mut args_iter = args_iter.clone().peekable();
+        let mut args_iter =
+            generic_args.iter().flat_map(|generic_args| generic_args.args.iter()).peekable();
 
         // If we encounter a type or const when we expect a lifetime, we infer the lifetimes.
         // If we later encounter a lifetime, we know that the arguments were provided in the