[LCG] Make this call graph a fully regular type by giving it assignment as well. I don't see any particular need but it imposes no cost to support it and it makes the API cleaner.
[LCG] Make this call graph a fully regular type by giving it assignment
as well. I don't see any particular need but it imposes no cost to
support it and it makes the API cleaner.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@203448 91177308-0d34-0410-b5e6-96231b3b80d8

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