[PATCH] D16530: [Polly] Introduce MemAccInst helper class; NFC

[Johannes Doerfert via llvm-commits]

> +/// getValueOperand() and getPointerOperand() have different implementations in
> +/// LoadInst and StoreInst, but for most other members the implementation is
> +/// identical. Those have been reproduced here to avoid useless branching to
> +/// identical implementations. If those implementations change in
> +/// LoadInst/StoreInst, they must be changed here as well.
The last sentence alone guarantees problems. Duplication is (almost)
never a solution, especially not to save a call/jump/branch.
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