[PATCH] D92133: [clangd] Cache .clang-tidy files again.

[Sam McCall via Phabricator via cfe-commits]

sammccall created this revision.
sammccall added reviewers: njames93, kbobyrev.
Herald added subscribers: cfe-commits, usaxena95, kadircet, arphaman.
Herald added a project: clang.
sammccall requested review of this revision.
Herald added subscribers: MaskRay, ilya-biryukov.

This cache went away in 73fdd998701cce3aa6c4d8d2a73ab97351a0313b <https://reviews.llvm.org/rG73fdd998701cce3aa6c4d8d2a73ab97351a0313b>

This time, the cache is periodically validated against disk, so config
is still mostly "live".

The per-file cache reuses FileCache, but the tree-of-file-caches is
duplicated from ConfigProvider. .clangd, .clang-tidy, .clang-format, and
compile_commands.json all have this pattern, we should extract it at some point.
TODO for now though.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D92133

Files:
  clang-tools-extra/clangd/TidyProvider.cpp

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