[PATCH] D135859: [Includecleaner] Introduce RefType to ast walking

[Kadir Cetinkaya via Phabricator via cfe-commits]

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RefTypes are distinct categories for each reference to a symbol. They
are signals indicating strength of a reference, that'll enable different
decision making based on the finding being provided.

There are 3 kinds of ref types:

- Explicit, the reference is spelled in the code.
- Implicit, the reference is not directly visible in the code.
- Related, the reference exists but can't be proven as used (e.g. overloads brought in by a using decl but not used by the code).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D135859

Files:
  clang-tools-extra/include-cleaner/lib/AnalysisInternal.h
  clang-tools-extra/include-cleaner/lib/WalkAST.cpp
  clang-tools-extra/include-cleaner/unittests/WalkASTTest.cpp

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