[llvm] [SimplifyCFG] Don't use a mask for lookup tables generated from switches with an unreachable default case (PR #94468)

[Nikita Popov via llvm-commits]

nikic wrote:

> > > Please rebase your PR, see: [07b9d23](https://github.com/llvm/llvm-project/commit/07b9d231ff9baa6473b0dd588a3ce5330d3e4871).
> > 
> > 
> > @DianQK I've rebased onto that, but it doesn't affect this PR since `SimplifyCFG/X86/switch_to_lookup_table.ll` doesn't appear to have been regenerated by that commit.
> 
> Sorry, I didn't notice. You can manually discard these changes.

I've regenerated the file now.

https://github.com/llvm/llvm-project/pull/94468