[PATCH] [Unroll] Rework the naming and structure of the new unroll heuristics.

[Michael Zolotukhin]

Hi Chandler,

In general I'm in favor for such changes, but my feeling is that `MaxThreshold` and `Threshold` are still pretty confusing. What about something like `TinyLoopsThreshold` and `BigLoopsThreshold`? The idea is that the `TinyLoopsThreshold` defines which loops are considered tiny (and which we unconditionally unroll), and `BigLoopsThreshold` defines huge loops, which will never be unrolled.

Other than that, the changes look good to me.

And by the way, thanks for your recent patches here!

Michael


http://reviews.llvm.org/D9966

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