[Polly] [Refactor] Make used analysis passes explicit

[Johannes Doerfert]

Hey Tobias,

 

We talked about this a while ago, now I attached a patch to make the use of
the LoopInfo, ScalarEvolution and the DomTree explicit in the backend.

I still need to write a mail to LLVM-dev (or a patch to llvm-commits) if I
want to change the SplitBlock interface the same way, but I think this makes
our code at least cleaner.

 

Best regards,

  Johannes

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