[llvm] [SimplifyIndVar] Push more users to worklist for simplifyUsers (PR #93598)

[Nikita Popov via llvm-commits]

nikic wrote:

Can you please also add a test for your last fix?

We do get a working stage2 build now: https://llvm-compile-time-tracker.com/compare.php?from=3c50cbfda4fc3ad85349167132f7ed809ecc685a&to=8c47a1722b8b303e3262a77f992fea606a0a305c&stat=instructions:u

https://github.com/llvm/llvm-project/pull/93598