[PATCH] This patch introduces MemorySSA, a virtual SSA form for memory.Details on what it looks like are in MemorySSA.h

[Daniel Berlin]

Make MemorySSA able to be lazy, and add a non-lazy pass for tests to use
Separate out walking interface, move caching walker to use it

Updating D7864: This patch introduces MemorySSA, a virtual SSA form for memory.
===============================================================================

Details on what it looks like are in MemorySSA.h


http://reviews.llvm.org/D7864

Files:
  include/llvm/Analysis/AliasAnalysis.h
  include/llvm/IR/Function.h
  include/llvm/InitializePasses.h
  include/llvm/Transforms/Utils/MemorySSA.h
  lib/Analysis/AliasAnalysis.cpp
  lib/Analysis/Analysis.cpp
  lib/Analysis/BasicAliasAnalysis.cpp
  lib/IR/AsmWriter.cpp
  lib/Transforms/Utils/CMakeLists.txt
  lib/Transforms/Utils/MemorySSA.cpp
  test/Transforms/Util/memoryssa-cyclicphi.ll
  test/Transforms/Util/memoryssa-optimize-use.ll

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