[PATCH] getStrideFromPointer and its helper function from LoopVectorize moved to VectorUtils

[Ashutosh Nema]

Hi chatur01, dblaikie, reames,

In this change, moved following function from LoopVectorizer to VectorUtils:

    a) getGEPInductionOperand
    b) stripGetElementPtr
    c) getUniqueCastUse
    d) getStrideFromPointer

These functions are common between loop vectorizer & upcoming loop versioning for LICM.
Earlier these functions are defined as static functions in LoopVectorize.cpp

For re-usability its good to keep them as utility.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10835

Files:
  include/llvm/Analysis/VectorUtils.h
  lib/Analysis/VectorUtils.cpp
  lib/Transforms/Vectorize/LoopVectorize.cpp

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