always use a ref ty to do transformation

compiler/rustc_symbol_mangling/src/v0.rs

@@ -596,13 +596,9 @@ impl<'tcx> Printer<'tcx> for SymbolMangler<'tcx> {
             // Handle `str` as partial support for unsized constants
             ty::Str => {
                 let tcx = self.tcx();
-                let ref_ty = if matches!(ct_ty.kind(), ty::Str) {
-                    // HACK(jaic1): hide the `str` type behind a reference
-                    // for the following transformation from valtree to raw bytes
-                    Ty::new_imm_ref(tcx, tcx.lifetimes.re_static, ct_ty)
-                } else {
-                    ct_ty
-                };
+                // HACK(jaic1): hide the `str` type behind a reference
+                // for the following transformation from valtree to raw bytes
+                let ref_ty = Ty::new_imm_ref(tcx, tcx.lifetimes.re_static, ct_ty);
                 let slice = valtree.try_to_raw_bytes(tcx, ref_ty).unwrap_or_else(|| {
                     bug!("expected to get raw bytes from valtree {:?} for type {:}", valtree, ct_ty)
                 });