[polly] scop detection: small cleanups

[Sebastian Pop]

Hi Tobi,

I have 3 more small cleanups for compile time. I already sent an email about
4/4, so I'm not attaching it again here:

[PATCH 1/4] scop detection: only execute print stmts under DEBUG
[PATCH 2/4] scop detection: check flag before expensive call
[PATCH 3/4] scop detection: inline and remove isValidBasicBlock
[PATCH 4/4] scop detection: detect regions bottom up

Ok to commit 1, 2, and 3?

Thanks,
Sebastian
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