[llvm] [MachinePipeliner] Add validation for missed loop-carried memory deps (PR #145878)

[Ryotaro Kasuga via llvm-commits]

kasuga-fj wrote:

> > @aankit-ca Could you please try your benchmark? I believe it works fine, but I'd like to make sure that there were no mistakes in splitting the original patch (#135148). Thanks in advance!
> 
> Thanks for the patch. I ran the numbers and I don't see any significant degradations!

@aankit-ca Thanks, really appreciate it! If you have a moment sometime, it'd be super helpful if you could take a look at the code too.

https://github.com/llvm/llvm-project/pull/145878