clangd/clangd 12.0.0

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This is the stable clangd 12.0.0 release, based on the LLVM release sources.

Release notes since clangd 11

Built from clangd/llvm-project@8a844a3 (official LLVM's 12.0.0 sources llvm/llvm-project@d28af7c with manual cherry-pick of llvm/llvm-project@ecf93a7)