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Update MemorySSA in SimpleLoopUnswitch.

Description

Update MemorySSA in SimpleLoopUnswitch.

Summary:
Teach SimpleLoopUnswitch to preserve MemorySSA.

Subscribers: sanjoy, jlebar, Prazek, george.burgess.iv, llvm-commits

Differential Revision: https://reviews.llvm.org/D47022

Details