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

[Shikhar Jayswal via cfe-commits]

tfninjadoom wrote:

I'm new to the processes of open-source software, so pardon my confusion. I just read through [this](https://github.com/clangd/clangd/issues/529) issue and am wondering: 
What's preventing this PR from being merged right now? All checks seem to have passed.

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