[PATCH] D103434: [analyzer] Allow visitors to run callbacks on completion

[Deep Majumder via Phabricator via cfe-commits]

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This patch introduces the concept of *Stoppable* visitors, ie, a
visitor that must perform some task when it runs out of nodes on which
it has work to do.
Initially, the `ReturnVisitor` is being made *stoppable*, thus allowing
it to run callbacks on completion. These callbacks are meant to be
supplied from `trackExpressionValue`.
Thus, this patch will also allow `trackExpressionValue` to recieve a
callback to run when it is done tracking.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D103434

Files:
  clang/include/clang/StaticAnalyzer/Core/BugReporter/BugReporterVisitors.h
  clang/lib/StaticAnalyzer/Core/BugReporterVisitors.cpp

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