Inline some functions that show up in perf runs

Author: oli-obk

compiler/rustc_middle/src/ty/context.rs

@@ -2817,6 +2817,7 @@ impl<'tcx> TyCtxt<'tcx> {
         self.mk_substs(iter::once(self_ty.into()).chain(rest))
     }
 
+    #[inline(always)]
     pub fn mk_trait_ref(
         self,
         trait_def_id: DefId,

compiler/rustc_middle/src/ty/sty.rs

@@ -807,10 +807,12 @@ pub struct TraitRef<'tcx> {
 }
 
 impl<'tcx> TraitRef<'tcx> {
+    #[inline(always)]
     pub fn new(def_id: DefId, substs: SubstsRef<'tcx>) -> TraitRef<'tcx> {
         TraitRef { def_id, substs }
     }
 
+    #[inline(always)]
     pub fn with_self_type(self, tcx: TyCtxt<'tcx>, self_ty: Ty<'tcx>) -> Self {
         tcx.mk_trait_ref(
             self.def_id,