[clang][Analysis] CallGraph: store the actual call Expr* in the CallGraphNode::CallRecord
Storing not just the callee, but the actual call may be interesting for some use-cases.
In particular, D72362 would like that to better pretty-print the cycles in call graph.
Reviewers: NoQ, erichkeane
Reviewed By: NoQ
Subscribers: martong, Charusso, cfe-commits
Differential Revision: https://reviews.llvm.org/D74081