[llvm] [test] Fix `coro-split-dbg-labels.ll` for non-x86 (PR #147087)

[Rainer Orth via llvm-commits]

rorth wrote:

> @rorth @asb Do you want to verify locally that this PR actually fixes the issue before I merge this? Or do you want me to land the patch as is? (hoping that it fixes the issue - in the worst case, it at least won't regress the current situation)

I already mentioned that the latest version of this PR fixes the SPARC failure and works on both Solaris/amd64 and Linux/x86_64.  I don't think there's anything blocking the merge: I'd rather see it happen sooner than later, given that the Solaris/sparcv9 bot has been red for 4 days now.

https://github.com/llvm/llvm-project/pull/147087