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[DomTree] Replace ChildrenGetter with GraphTraits over GraphDiff.

Authored by asbirlea on Apr 10 2020, 12:34 AM.

Description

[DomTree] Replace ChildrenGetter with GraphTraits over GraphDiff.

This replaces the ChildrenGetter inside the DominatorTree with
GraphTraits over a GraphDiff object, an object which encapsulated the
view of the previous CFG.
This also simplifies the extentions in clang which use DominatorTree, as
GraphDiff also filters nullptrs.

Re-land a90374988e4eb8c50d91e11f4e61cdbd5debb235 after moving CFGDiff.h
to Support.

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