[PATCH] [ScalarEvolution] refactor: extract interface getGEPExpr

[Jingyue Wu]

Hi atrick, sanjoy,

This allows other passes (such as SLSR) to compute the SCEV expression for an
imaginary GEP.

http://reviews.llvm.org/D9786

Files:
  include/llvm/Analysis/ScalarEvolution.h
  lib/Analysis/ScalarEvolution.cpp
  lib/Transforms/Scalar/StraightLineStrengthReduce.cpp

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