[PATCH] D26127: [MemorySSA] Repair AccessList invariants after insertion of new MemoryUseOrDef.

[Daniel Berlin via llvm-commits]

>
> If you want on the fly updating for stores, where you aren't doing
> replacement, that's quite expensive.
>

And FWIW: The *only* passes that actually require it are those doing real
instrumentation.
(IE none of our optimization passes, even those like GVN, need this).
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