[PATCH] D15720: [Polly] Use assumed context during ast generation

[Johannes Doerfert via llvm-commits]

> Meinersbur added a comment.
> 
> Summary missing?
> 
> Could you explain why this changes anything, because the scheduler
> should produce a schedule withing the assumed context only. (i.e.
> because we gist the assumed context before scheduling if I am not
> mistaken)
It does not. There is no assumed context involved in scheduling.

> Does this change the output other than adding conditionals? I guess
> these are irrelevant because they are checked beforehand for loop
> versioning anyway. Do the additional conditions affect execution time?
This removes dead statements from the schedule and hence the AST.
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