[PATCH] Optimize double storing by memset; memcpy (Take two)

[Ahmed Bougacha]

Tweak Joel's patch here and there, mainly:
- correct a size problem
- try to keep as much alignment as possible

http://reviews.llvm.org/D498

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