[llvm] [SystemZ] Eliminate call sequence instructions early. (PR #77812)

[Ulrich Weigand via llvm-commits]

uweigand wrote:

> > Do you have any numbers how benchmarks would be affected by just removing the instructions early?
> 
> See above: [#77812 (comment)](https://github.com/llvm/llvm-project/pull/77812#discussion_r1450911878)

Right - I meant do we know whether these few extra instructions actually cause any visible difference in the results anywhere?
 
> > Do we know what specifically could be improved? (I guess we'd have to identify some actual regression first ...)
> 
> I can give it a try and see...

Thanks!


https://github.com/llvm/llvm-project/pull/77812