[PATCH] D29519: Add PredicateInfo utility and printing pass

[Daniel Berlin via llvm-commits]

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> ================
> Comment at: lib/Transforms/Utils/PredicateInfo.cpp:65-73
> +struct ValueDFS {
> +  int DFSIn = 0;
> +  int DFSOut = 0;
> +  unsigned int LocalNum = LN_Middle;
> +  PredicateBase *PInfo = nullptr;
> +  // Only one of Def or Use will be set.
> +  Value *Def = nullptr;
> ----------------
> We have this similar pattern in many places now: `NewGVN`, `SSAUpdater`,
> `MemSSA` and now here. Too bad we can't actually share more.
>
>
FWIW, i'm going to merge most of these and template out the part they don't
share

I have a patch to NewGVN to template it, and then started figuring out how
to merge them all.
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