[llvm] r321751 - StructurizeCFG: Fix broken backedge detection

[Matt Arsenault via llvm-commits]

> On Jan 3, 2018, at 20:47, Galina Kistanova via llvm-commits <llvm-commits at lists.llvm.org> wrote:
> 
> Hello Matt,
> 
> It looks like this commit broke tests to one of our builders:
> http://lab.llvm.org:8011/builders/llvm-clang-x86_64-expensive-checks-win <http://lab.llvm.org:8011/builders/llvm-clang-x86_64-expensive-checks-win>
> 
> . . .
> Failing Tests (1):
>     LLVM :: Transforms/StructurizeCFG/AMDGPU/backedge-id-bug.ll
> 
> Please have a look?
> 
> Thanks
> 
> Galina
> 
> 

It looks like the second testcase variant has an issue with the RegionInfo construction that occurs with expensive checks / -verify-region-info enabled. It happens without the patch too, so I’ll just split that into a separate XFAILed testcase for now

-Matt

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