`indexing-with-bools-no-redundant-instructions.rs` fails on LLVM 23

[clubby789]

The update to LLVM 23 regressed this test: #158734 (comment). This should be investigated further.

Previous issue: #123216

[durin42]

If I'm reading the change in output right it's just an ordering change to xorb, and we could accept either, eg:

-    // CHECK: xorb   %dl, %dil
+    // CHECK: xorb   {{%dl, %dil|%dil, %dl}}

[RalfJung]

Test was added in #159977.
Cc @amirHdev