Jan Svoboda 105c913156 [clang][lex] NFC: Simplify calls to LookupFile ...

The `{HeaderSearch,Preprocessor}::LookupFile()` functions take an out-parameter `const DirectoryLookup *&`. Most callers end up creating a `const DirectoryLookup *` variable that's otherwise unused.

This patch changes the out-parameter from reference to a pointer, making it possible to simply pass `nullptr` to the function without the ceremony.

Reviewed By: ahoppen

Differential Revision: https://reviews.llvm.org/D117312

2022-01-18 16:02:18 +01:00

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