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

[Michael Zolotukhin]

Partly address Chandler's remarks:

- Inline analyzeBlock and addBBSuccessors.
- Hoist worklist declaration out of the loop.
- Replace breaks with returns.

The rest is coming shortly.


http://reviews.llvm.org/D7837

Files:
  lib/Transforms/Scalar/LoopUnrollPass.cpp
  test/Transforms/LoopUnroll/full-unroll-early-exit.ll
  test/Transforms/LoopUnroll/full-unroll-no-taken-branch.ll

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