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

[Michael Zolotukhin]

Addressing Chandler's remarks, continued:

- Inline findConstantPointers into GEP-instructions visitor.
- Inline simulateLoop into analyzeLoop + some other simplifications.
- Don't try to handle early exits.


http://reviews.llvm.org/D7837

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

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