[PATCH] D156254: [clang][dataflow] Add convenience function for analysing and `FunctionDecl` and diagnosing it.

[Yitzhak Mandelbaum via Phabricator via cfe-commits]

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The convenience function captures running the analysis and then collecting
diagnostics based on a `Diagnoser` object. This pattern is valuable to
clang-tidy checks which analyze a function at a time, though it could be more
generally useful for analysis clients.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D156254

Files:
  clang/include/clang/Analysis/FlowSensitive/DataflowAnalysis.h
  clang/include/clang/Analysis/FlowSensitive/MatchSwitch.h
  clang/include/clang/Analysis/FlowSensitive/NoopAnalysis.h
  clang/unittests/Analysis/FlowSensitive/TypeErasedDataflowAnalysisTest.cpp

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