[clang-tools-extra] [clangd] fix compilation errors with newer versions of gRPC (PR #67258)

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0xacc wrote:

> @0xacc, please investigate this breakage, and revert if necessary.

Hi @Thibault-Monnier, I have checked out the failure logs above. The two failed tests (ELF/ppc64-toc-call-to-pcrel-long-jump.s and ExecutionEngine/JITLink/x86-64/COFF_directive_alternatename_fail.s) don’t seem related to this PR: they are written in assembly without dependencies and passed on the subsequent commit `8c575312fc49378a3ee7fb070819d3f7790bdb0a` on the`main` branch that already includes this change. So I don’t think this PR introduced the breakage.

Is there a way to retry the tests? I tried to click the `Rebuild` button on LLVM Buildbot page, but it says `Cannot rebuild: You must be an author of the commit triggered the build.`

https://github.com/llvm/llvm-project/pull/67258