[PATCH] Optimize double storing by memset; memcpy

[Ahmed Bougacha]

Ping for review!

Reworded a few of the comments.

http://reviews.llvm.org/D498

Files:
  lib/Transforms/Scalar/MemCpyOptimizer.cpp
  test/Transforms/MemCpyOpt/memset-memcpy-redundant-memset.ll
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