Rename folder traits' tcx method to interner

compiler/rustc_trait_selection/src/traits/auto_trait.rs

@@ -860,7 +860,7 @@ pub struct RegionReplacer<'a, 'tcx> {
 }
 
 impl<'a, 'tcx> TypeFolder<TyCtxt<'tcx>> for RegionReplacer<'a, 'tcx> {
-    fn tcx<'b>(&'b self) -> TyCtxt<'tcx> {
+    fn interner(&self) -> TyCtxt<'tcx> {
         self.tcx
     }