[PATCH] D131241: [Clang][Lex] Extend HeaderSearch::LookupFile to control OpenFile behavior.

[Jun Zhang via Phabricator via cfe-commits]

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In the downstream projects (ROOT and Cling), we want to do header files
lookups but no `OpenFile` behavior as we only need to register the file
name.

This patch extends the original API call by adding some optional flags
so we can continue use it in the previous way with no breakage.
Signed-off-by: Jun Zhang <jun at junz.org>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D131241

Files:
  clang/include/clang/Lex/DirectoryLookup.h
  clang/include/clang/Lex/HeaderSearch.h
  clang/include/clang/Lex/Preprocessor.h
  clang/lib/Lex/HeaderSearch.cpp
  clang/lib/Lex/PPDirectives.cpp

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