[PATCH] D83099: Revert "[clangd] Store index in '.clangd/index' instead of '.clangd-index'"

[Sam McCall via Phabricator via llvm-commits]

sammccall created this revision.
sammccall added reviewers: kadircet, hokein.
Herald added subscribers: llvm-commits, cfe-commits, usaxena95, arphaman, omtcyfz, jkorous, MaskRay, ilya-biryukov.
Herald added projects: clang, LLVM.

This was well-intentioned, but it turns out `.clangd` is the best
filename for the clangd config file (matching .clang-format and .clang-tidy).
And of course we can't have both .clangd/index and .clangd...

So lacking better ideas, back to .clangd-index we go.
The monorepo gitignore is updated to reflect the new best-practice:

  ignore .clangd/ (with trailing slash) matching index files from clangd 9/10
  ignore .clangd-index/ matching index files from clangd <=8 and 11+.

The entries from llvm-project/llvm gitignore are removed (obsolete).

This reverts commit 2754942cbaef0b72c178e34247611521382c361c.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D83099

Files:
  .gitignore
  clang-tools-extra/clangd/index/Background.h
  clang-tools-extra/clangd/index/BackgroundIndexStorage.cpp
  clang-tools-extra/clangd/test/background-index.test
  llvm/.gitignore

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