Inline lower_generic_args_of_trait_ref

Only had a single call site and having it as a separate method
didn't gain us anything.

Author: fmease

compiler/rustc_hir_analysis/src/hir_ty_lowering/mod.rs

@@ -751,33 +751,9 @@ impl<'o, 'tcx> dyn HirTyLowerer<'tcx> + 'o {
         // FIXME(effects): Move all host param things in HIR ty lowering to AST lowering.
         constness: ty::BoundConstness,
     ) -> ty::TraitRef<'tcx> {
-        let (generic_args, _) = self.lower_generic_args_of_trait_ref(
-            span,
-            trait_def_id,
-            self_ty,
-            trait_segment,
-            is_impl,
-            constness,
-        );
-        if let Some(b) = trait_segment.args().bindings.first() {
-            prohibit_assoc_item_binding(self.tcx(), b.span, Some((trait_segment, span)));
-        }
-        ty::TraitRef::new(self.tcx(), trait_def_id, generic_args)
-    }
-
-    #[instrument(level = "debug", skip(self, span))]
-    fn lower_generic_args_of_trait_ref<'a>(
-        &self,
-        span: Span,
-        trait_def_id: DefId,
-        self_ty: Ty<'tcx>,
-        trait_segment: &'a hir::PathSegment<'tcx>,
-        is_impl: bool,
-        constness: ty::BoundConstness,
-    ) -> (GenericArgsRef<'tcx>, GenericArgCountResult) {
         self.complain_about_internal_fn_trait(span, trait_def_id, trait_segment, is_impl);
 
-        self.lower_generic_args_of_path(
+        let (generic_args, _) = self.lower_generic_args_of_path(
             span,
             trait_def_id,
             &[],
@@ -786,7 +762,11 @@ impl<'o, 'tcx> dyn HirTyLowerer<'tcx> + 'o {
             trait_segment.infer_args,
             Some(self_ty),
             constness,
-        )
+        );
+        if let Some(b) = trait_segment.args().bindings.first() {
+            prohibit_assoc_item_binding(self.tcx(), b.span, Some((trait_segment, span)));
+        }
+        ty::TraitRef::new(self.tcx(), trait_def_id, generic_args)
     }
 
     fn probe_trait_that_defines_assoc_item(