[PATCH] D23171: [MemorySSA] Ensure address stability of MemorySSA object.

[Geoff Berry via llvm-commits]

gberry created this revision.
gberry added reviewers: george.burgess.iv, dberlin.
gberry added subscribers: llvm-commits, silvas, chandlerc, hfinkel.
Herald added a subscriber: mcrosier.

Ensure that the MemorySSA object never changes address when using the
new pass manager since the walkers contained by MemorySSA cache pointers
to it at construction time.  This is achieved by wrapping the
MemorySSAAnalysis result in a unique_ptr.  Also add some asserts that
check for this bug.

https://reviews.llvm.org/D23171

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

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