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[MemorySSA] Invalidate MemorySSA if AA or DT are invalidated.

Authored by asbirlea on Apr 30 2019, 3:43 PM.

Description

[MemorySSA] Invalidate MemorySSA if AA or DT are invalidated.

Summary:
MemorySSA keeps internal pointers of AA and DT.
If these get invalidated, so should MemorySSA.

Reviewers: george.burgess.iv, chandlerc

Subscribers: jlebar, Prazek, llvm-commits

Tags: LLVM

Differential Revision: https://reviews.llvm.org/D61043

llvm-svn: 359627