Accept TyCtxt instead of TyCtxtAt in Ty::is_* functions

Functions in answer:

- `Ty::is_freeze`
- `Ty::is_sized`
- `Ty::is_unpin`
- `Ty::is_copy_modulo_regions`

compiler/rustc_const_eval/src/const_eval/valtrees.rs

@@ -212,7 +212,7 @@ fn create_pointee_place<'tcx>(
 ) -> MPlaceTy<'tcx> {
     let tcx = ecx.tcx.tcx;
 
-    if !ty.is_sized(ecx.tcx, ty::ParamEnv::empty()) {
+    if !ty.is_sized(*ecx.tcx, ty::ParamEnv::empty()) {
         // We need to create `Allocation`s for custom DSTs
 
         let (unsized_inner_ty, num_elems) = get_info_on_unsized_field(ty, valtree, tcx);
@@ -398,7 +398,7 @@ fn valtree_into_mplace<'tcx>(
 
                 let mut place_inner = match ty.kind() {
                     ty::Str | ty::Slice(_) => ecx.mplace_index(&place, i as u64).unwrap(),
-                    _ if !ty.is_sized(ecx.tcx, ty::ParamEnv::empty())
+                    _ if !ty.is_sized(*ecx.tcx, ty::ParamEnv::empty())
                         && i == branches.len() - 1 =>
                     {
                         // Note: For custom DSTs we need to manually process the last unsized field.