Remove CallGraphTraits and use equivalent methods in GraphTraits
Summary:
D42698 adds child_edge_{begin|end} and children_edges to GraphTraits
which are used here. The reason for this change is to make it easy to
use count propagation on ModulesummaryIndex. As it stands,
CallGraphTraits is in Analysis while ModuleSummaryIndex is in IR.
Reviewers: davidxl, dberlin
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D42703
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@323994
91177308-0d34-0410-b5e6-
96231b3b80d8
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