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

[Michael Zolotukhin]

- Rebase on master.
- Rename SCEVSimplify to simplifyInstWithSCEV.
- Use assert + getSExtValue instead of getLimitedValue and remove no
- Introduce SimplifiedOffsets.
- Remove unneeded code.
- Move initialize of IterationNumber to constructor.
- Doxygenify comment for SimplifiedValues.
- Fallback to Base visitor if failed to constant fold (and only then call simplifyInstWithSCEV).


http://reviews.llvm.org/D10205

Files:
  lib/Transforms/Scalar/LoopUnrollPass.cpp

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