[clang] [clang-tools-extra] [clangd] Support parsing comments without ASTContext (PR #78491)

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cor3ntin wrote:

PRs need to be reviewed before they can be merged.
Feel free to ping PR once a week (at most) if no one gets to it.
This seem to have flown under the radar. sorry about that

https://github.com/llvm/llvm-project/pull/78491