[PATCH] Estimate DCE effect in heuristic for estimating complete-unroll optimization effects.

[Michael Zolotukhin]

- Rebase ontop of the recent trunk.
- Add a test.


http://reviews.llvm.org/D8817

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

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