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

[Michael Zolotukhin]

Hi hfinkel, chandlerc,

This patch reimplements heuristic that tries to estimate optimization beneftis
from complete loop unrolling.

In this patch I kept the minimal changes - e.g. I removed code handling
branches and folding compares. That's a promising area, but now there
are too many questions to discuss before we can enable it.

http://reviews.llvm.org/D8816

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

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