[PATCH] Extend LoopVectorizationLegality::isConsecutivePtr to handle multiple level GEPs

[Wei Mi]

I made a fix to use dyn_cast_or_null and simplified the test. PTAL.


REPOSITORY
  rL LLVM

http://reviews.llvm.org/D10281

Files:
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/pr23580.ll

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