[PATCH] [NaryReassoc] reassociate GEP for CSE

[Jingyue Wu]

Hi broune, meheff,

x = &a[i];
y = &a[i + j];

=>

y = x + j;

along with some refactoring work such as extracting method
findClosestMatchingDominator.

Depends on D9786 which provides the ScalarEvolution::getGEPExpr interface.

http://reviews.llvm.org/D9802

Files:
  lib/Transforms/Scalar/NaryReassociate.cpp
  test/Transforms/NaryReassociate/NVPTX/nary-gep.ll

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