[PATCH] D119825: [clang][lex] Introduce `SearchDirIndex` to usage tracking code

[Jan Svoboda via Phabricator via cfe-commits]

jansvoboda11 created this revision.
jansvoboda11 added reviewers: ahoppen, Bigcheese, dexonsmith.
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This patch introduces new `SearchDirIndex` type to the internal `HeaderSearch` code that tracks search path usage. The type replaces the current uses of `unsigned` to identify `DirectoryLookup` objects.

In a follow-up patch (D116750 <https://reviews.llvm.org/D116750>), this type will become resilient against insertions "into the middle" of `SearchDirs` as done by `HeaderSearch::AddSearchPath()`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D119825

Files:
  clang/include/clang/Lex/HeaderSearch.h
  clang/lib/Lex/HeaderSearch.cpp

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