[polly] reorganize scop detection for faster compiles

[Sebastian Pop]

Hi Tobi,

Here are two patches that reorganize scop detection filters: the idea behind these
patches is to run the lightweight passes accessing the CFG and LoopInfo before
starting iterating over instructions in basic blocks.

With these and previous patches, we still have room for improvement: here is
what I still see in one of the files:

285.8400 ( 69.2%)   2.1700 ( 44.7%)  288.0100 ( 68.9%)  295.9582 ( 67.8%)  Polly - Detect static control parts (SCoPs)

Ok to commit?

Thanks,
Sebastian
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