[PATCH] [Transforms/Scalar/SeparateConstOffsetFromGEP] Add the extracted offset using GEP

[Jingyue Wu]

Hi eliben, hfinkel,

Fixed a TODO in the original code. 

We add the extracted constant offset using GEP instead of ugly ptrtoint+add+inttoptr. Using GEP simplifies future optimizations and makes IR easier to understand. 

Updated all affected tests, and added a new test in split-gep.ll to cover a corner case where uglygep is necessary.

http://reviews.llvm.org/D3882

Files:
  lib/Transforms/Scalar/SeparateConstOffsetFromGEP.cpp
  test/Transforms/SeparateConstOffsetFromGEP/NVPTX/split-gep-and-gvn.ll
  test/Transforms/SeparateConstOffsetFromGEP/NVPTX/split-gep.ll
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