mtrofin wrote:

> The more I think about it, the more I think it makes sense to just run GUID 
> assignment. It's a no-op if we have existing GUID metadata. Maybe at some 
> point we enforce GUID presence, but I think we're a ways off from that, so in 
> the mean time we should just ensure we can handle arbitrary legal IR in 
> llvm-reduce.

Do we know why it might not have GUID metadata? Is it a reducer artifact? I.e. 
should the reducer know not the remove GUID if present?

https://github.com/llvm/llvm-project/pull/208965
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