[PATCH] Add basic support for removal of load that are fed by a store of an aggregate

[Björn Steinbrink]

If we have a simple load through a GEP that is fed by a store of an
aggregate, we can use the GEP indices to walk the stored aggregate and
extract the appropriate value to replace the load.

http://reviews.llvm.org/D6829

Files:
  include/llvm/Analysis/Loads.h
  lib/Analysis/Loads.cpp
  lib/Transforms/Scalar/GVN.cpp
  test/Transforms/GVN/load-from-fca.ll

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