Johannes Doerfert 72277ecd62 Introduce a CallGraph updater helper class ...

The CallGraphUpdater is a helper that simplifies the process of updating
the call graph, both old and new style, while running an CGSCC pass.

The uses are contained in different commits, e.g. D70767.

More functionality is added as we need it.

Reviewed By: modocache, hfinkel

Differential Revision: https://reviews.llvm.org/D70927

2020-02-08 14:16:48 -06:00

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