[PATCH] D123669: [ArgPromotion] Use SmallVector to traverse values

[Pavel Samolysov via Phabricator via llvm-commits]

psamolysov added a comment.

@nikic

> So, I think it's safe to drop this Visited set in this case, but I would usually consider it good practice to have one, in the interest of defensiveness.

I agree, the code may be changed in the future and the change can be unsafe if the developer won't take into account the idea why the Visited set is not used *now*. I see two ways: to add a comment why using a  `SmallVector` to store the worklist and not using of the Visited set is safe in our case, or to add the Visited set into dead instruction collecting loop in the `doPromotion` function too, for consistency.  What could be better from your point of view?


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https://reviews.llvm.org/D123669