[PATCH] Remove SCEVCache and FindConstantPointers from complete loop unrolling heuristic.

[Michael Zolotukhin]

Hi chandlerc,

Using some SCEV functionality helped to entirely remove SCEVCache class and FindConstantPointers SCEV visitor.
Also, this makes the code more universal - I'll take advandate of it in next patches where I start handling additional types of instructions.

http://reviews.llvm.org/D10205

Files:
  lib/Transforms/Scalar/LoopUnrollPass.cpp

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