[PATCH] [GVN] Perform Scalar PRE on gep indices that feed loads before doing Load PRE

[Balaram Makam]

Addressed Daniel's comment and also rebased.

http://reviews.llvm.org/D6103

Files:
  lib/Transforms/Scalar/GVN.cpp
  test/Transforms/GVN/pre-gep-load.ll
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