llvm-project

4957c473 - [clang] Avoid reparsing VFS overlay files for module dep collector (#158372)

[clang] Avoid reparsing VFS overlay files for module dep collector (#158372) This PR uses the new-ish `llvm::vfs::FileSystem::visit()` interface to collect VFS overlay entries from an existing `FileSystem` instance rather than parsing the VFS YAML file anew. This prevents duplicate diagnostics as observed by `clang/test/VFS/broken-vfs-module-dep.c`.