[PATCH] Reimplement heuristic for estimating complete-unroll optimization effects.

[Michael Zolotukhin]

Rebase to trunk:

- Reimplement heuristic for estimating complete-unroll optimization effects.
- Address Chandler's remarks.
- Address Chandler's remarks.
- Address Chandler's remarks.
- Fix merge fail.
- Address Chandler's remarks.
- Address Chandler's remarks.


http://reviews.llvm.org/D8816

Files:
  lib/Transforms/Scalar/LoopUnrollPass.cpp
  test/Transforms/LoopUnroll/full-unroll-heuristics.ll

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