[PATCH] D17157: Add the beginnings of an update API for preserving MemorySSA

[Daniel Berlin via llvm-commits]

dberlin created this revision.
dberlin added reviewers: hfinkel, reames.
dberlin added a subscriber: llvm-commits.

This adds the beginning of an update API to preserve MemorySSA.  In particular,
this patch adds a way to remove memory SSA accesses when instructions are
deleted.

It also adds relevant unit testing infrastructure for MemorySSA's API.

(There is an actual user of this API, i will make that diff dependent on this one.  In practice, a ton of opt passes remove memory instructions, so it's hopefully an obviously useful API :P)

http://reviews.llvm.org/D17157

Files:
  include/llvm/Transforms/Utils/MemorySSA.h
  lib/Transforms/Utils/MemorySSA.cpp
  unittests/Transforms/Utils/CMakeLists.txt
  unittests/Transforms/Utils/MemorySSA.cpp

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