[llvm] llvm-reduce: Remove unsupported from bitcode uselistorder test (PR #134185)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> I remember hitting this assert not that long ago when reducing the test case for #131355 . Thankfully I was able to fallback to bugpoint, but in general it was easy to trigger eat when reducing miscompile caused by non-determinism in the compiler (which lack of uselists is only a small part of). If llvm-reduce can gracefully recover from this now, then great!

It's not a graceful recovery, it's silently ignoring. If you can reduce produce a test that hits this, that would be great 

https://github.com/llvm/llvm-project/pull/134185