Plumb dyn trait representation through ty::Dynamic

compiler/rustc_middle/src/ty/context.rs

@@ -63,7 +63,9 @@ use rustc_span::{Span, DUMMY_SP};
 use rustc_target::abi::{Layout, LayoutS, TargetDataLayout, VariantIdx};
 use rustc_target::spec::abi;
 use rustc_type_ir::sty::TyKind::*;
-use rustc_type_ir::{InternAs, InternIteratorElement, Interner, TypeFlags};
+use rustc_type_ir::{
+    InternAs, InternIteratorElement, Interner, TraitObjectRepresentation, TypeFlags,
+};
 
 use std::any::Any;
 use std::borrow::Borrow;
@@ -2545,8 +2547,9 @@ impl<'tcx> TyCtxt<'tcx> {
         self,
         obj: &'tcx List<ty::Binder<'tcx, ExistentialPredicate<'tcx>>>,
         reg: ty::Region<'tcx>,
+        repr: TraitObjectRepresentation,
     ) -> Ty<'tcx> {
-        self.mk_ty(Dynamic(obj, reg))
+        self.mk_ty(Dynamic(obj, reg, repr))
     }
 
     #[inline]