[PATCH] D87901: [Driver] Filter out <libdir>/gcc and <libdir>/gcc-cross if they do not exists

[Fangrui Song via Phabricator via cfe-commits]

MaskRay accepted this revision.
MaskRay added a comment.
This revision is now accepted and ready to land.

> For my installation configured with -DCMAKE_INSTALL_PREFIX=/home/antipov/.local/llvm-12.0.0, it's possible to filter out 80 of 200 VFS lookups, from:

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https://reviews.llvm.org/D87901