[clang] [clang-tools-extra] [clangd] Add missing SymbolKind cases to YAML serialization (PR #222070)

[Andre Sun via cfe-commits]

and2049 wrote:

> > Thanks @ArcsinX, could you merge it whenever convenient, I don't have commit access.
> 
> Sure. Can you please remove information about `Count` from PR description? I will use this description as a commit message on your behalf

Done, thanks again!

https://github.com/llvm/llvm-project/pull/222070