tree a27576177e862b9cf68a4e246e21347040c0d583
parent 52843300bf1a3a1cda8a483d520ba750216ff907
author Florian Hahn <flo@fhahn.com> 1618669374 +0100
committer Copybara-Service <copybara-worker@google.com> 1618720378 -0700

[ADT] Take graph as const & in some post-order iterators (NFC).

This patch updates a couple of functions that unnecessarily took the
input graph by value, when it was not needed. They can take the graph by
const-reference instead, which does not require GraphT to provide a copy
constructor.

Split off from D100169.

GitOrigin-RevId: bbf01f96b5ccc1dcb4d1d47cb55292c27c698dbb