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

[Danila Malyutin via llvm-commits]

danilaml wrote:

@arsenm well, it was potentially flaky as the  bug depended on the order of iteration of SmallPtrSet (actual bug was elsewhere but it was triggered by certain iteration orders) which depends on runtime values of pointers but in practice it was 100% reproducible o machines I've tried but failed in llvm-reduce. Maybe it had something to do with the way "counting chunks" was done (i.e. it wasn't the same as running fresh opt on IR). Not sure I have any tests that work with recent master and don't know if I'll be able to spot them if I hit this issue in the future. I guess I'll need to look out for the assert-turned-warning message (hopefully it wouldn't be drawn out by typical reduce log)?

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