[PATCH] D71910: [Attributor] Add helper to change an instruction to `unreachable` inst

[Hideto Ueno via Phabricator via llvm-commits]

uenoku added a comment.

In D71910#1796777 <https://reviews.llvm.org/D71910#1796777>, @jdoerfert wrote:

> This makes sense and LGTM.
>
> FWIW. We have to go over the entire "rewrite after manifest" stuff soon.


I think so too.


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