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[Attributor] Track AA dependency using dependency graph

Authored by bbn on Tue, Jul 28, 3:02 AM.

Description

[Attributor] Track AA dependency using dependency graph

This patch added dependency graph to the attributor so that we can dump the dependencies between AAs more easily. We can also apply general graph algorithms to the graph, making it easier for us to create deep wrappers.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D78861

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