[PATCH] D35918: [GVNHoist] Factor out reachability to search for anticipable instructions quickly

[Aditya Kumar via Phabricator via llvm-commits]

hiraditya added a comment.

In https://reviews.llvm.org/D35918#822143, @dberlin wrote:

> FYI: IDFCalculator can compute the PostDominanceFrontier in linear time.


I was unable to find how to pass the root node of inverse graph, because there might be more than one root.
Thanks,


https://reviews.llvm.org/D35918