Remove a hir_* helper that was just forwarding to a query

Author: oli-obk

compiler/rustc_middle/src/hir/map.rs

@@ -367,10 +367,6 @@ impl<'tcx> TyCtxt<'tcx> {
         }
     }
 
-    pub fn hir_trait_impls(self, trait_did: DefId) -> &'tcx [LocalDefId] {
-        self.local_trait_impls(trait_did)
-    }
-
     /// Gets the attributes on the crate. This is preferable to
     /// invoking `krate.attrs` because it registers a tighter
     /// dep-graph access.

compiler/rustc_middle/src/ty/trait_def.rs

@@ -235,7 +235,7 @@ pub(super) fn trait_impls_of_provider(tcx: TyCtxt<'_>, trait_id: DefId) -> Trait
         }
     }
 
-    for &impl_def_id in tcx.hir_trait_impls(trait_id) {
+    for &impl_def_id in tcx.local_trait_impls(trait_id) {
         let impl_def_id = impl_def_id.to_def_id();
 
         let impl_self_ty = tcx.type_of(impl_def_id).instantiate_identity();

compiler/rustc_trait_selection/src/error_reporting/infer/nice_region_error/static_impl_trait.rs

@@ -365,7 +365,7 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
                 // obligation comes from the `impl`. Find that `impl` so that we can point
                 // at it in the suggestion.
                 let trait_did = trait_id.to_def_id();
-                tcx.hir_trait_impls(trait_did).iter().find_map(|&impl_did| {
+                tcx.local_trait_impls(trait_did).iter().find_map(|&impl_did| {
                     if let Node::Item(Item {
                         kind: ItemKind::Impl(hir::Impl { self_ty, .. }), ..
                     }) = tcx.hir_node_by_def_id(impl_did)