[polly] r256199 - Add option to assume single-loop scops with sufficient compute are profitable

[Johannes Doerfert via llvm-commits]

On 12/22, Tobias Grosser wrote:
> On 12/22/2015 12:09 PM, Johannes Doerfert wrote:
> >In this spirit I would like to change the default heuristic to:
> >   #loops + #blocks > 2
> >as that is the condition under which we can perform "by default enabled"
> >optimizations.
> 
> If this results in run-time benefits for at least one application we care
> about and no run-time regressions, then I think this is fine.
> 
> (I care a little less about compile-time regressions. The more we expose
> them, the more visible they become and the more likely we are
> to add improvements here).
It will at least trigger distribution on Spec2006 hmmer. I think that's
worth it.
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