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Reapply "[DomTree] Replace ChildrenGetter with GraphTraits over GraphDiff."

Authored by asbirlea on Apr 9 2020, 6:29 PM.

Description

Reapply "[DomTree] Replace ChildrenGetter with GraphTraits over GraphDiff."

This is the part of the patch that's moving the Updates to a CFGDiff
object. Splitting off from the clean-up work merging the two branches when BUI is null.

Differential Revision: https://reviews.llvm.org/D77341