Allow codegen to unsize dyn* to dyn

cg_clif counterpart to rust-lang/rust#106532

scripts/test_rustc_tests.sh

@@ -113,7 +113,6 @@ rm tests/ui/simd/intrinsic/generic-reduction-pass.rs # simd_reduce_add_unordered
 rm tests/ui/simd/intrinsic/generic-as.rs # crash when accessing vector type filed (#1318)
 rm tests/ui/simd/simd-bitmask.rs # crash
 
-rm tests/ui/dyn-star/dyn-star-to-dyn.rs
 rm tests/ui/dyn-star/dispatch-on-pin-mut.rs
 
 # bugs in the test suite

src/unsize.rs

@@ -28,9 +28,7 @@ pub(crate) fn unsized_info<'tcx>(
         (
             &ty::Dynamic(ref data_a, _, src_dyn_kind),
             &ty::Dynamic(ref data_b, _, target_dyn_kind),
-        ) => {
-            assert_eq!(src_dyn_kind, target_dyn_kind);
-
+        ) if src_dyn_kind == target_dyn_kind => {
             let old_info =
                 old_info.expect("unsized_info: missing old info for trait upcasting coercion");
             if data_a.principal_def_id() == data_b.principal_def_id() {