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

[Michael Zolotukhin]

LGTM.


================
Comment at: test/Transforms/LoopUnroll/full-unroll-heuristics.ll:4
@@ -3,3 +3,3 @@
 ;  1) -unroll-threshold
-;  2) -unroll-absolute-threshold and
-;  3) -unroll-percent-of-optimized-for-complete-unroll
+;  2) -unroll-max-threshold and
+;  3) -unroll-percent-cost-saved-threshold
----------------
Please update the comment.

http://reviews.llvm.org/D9966

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