[clang-tools-extra] Add .gitignore file in .cache/clangd/index (PR #170003)

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github-actions[bot] wrote:

<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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<summary>
You can test this locally with the following command:
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang-tools-extra/clangd/index/BackgroundIndexStorage.cpp --diff_from_common_commit
``````````

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<details>
<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/clang-tools-extra/clangd/index/BackgroundIndexStorage.cpp b/clang-tools-extra/clangd/index/BackgroundIndexStorage.cpp
index 1dff0b55f..7b8843c4e 100644
--- a/clang-tools-extra/clangd/index/BackgroundIndexStorage.cpp
+++ b/clang-tools-extra/clangd/index/BackgroundIndexStorage.cpp
@@ -51,12 +51,12 @@ public:
       llvm::sys::path::append(GitignorePath, ".gitignore");
       if (!llvm::sys::fs::exists(GitignorePath)) {
         llvm::raw_fd_ostream GitignoreFile(GitignorePath, EC,
-                                          llvm::sys::fs::OF_None);
+                                           llvm::sys::fs::OF_None);
         if (EC == OK) {
           GitignoreFile << "*\n";
         } else {
           elog("Failed to create .gitignore in {0}: {1}", DiskShardRoot,
-              EC.message());
+               EC.message());
         }
       }
     }

``````````

</details>


https://github.com/llvm/llvm-project/pull/170003