Backport fix for #142608 to the 20.x branch

[HighCommander4]

I would like to backport #143087 (which fixes #142608) to the 20.x branch.

This is a simple / low-risk fix for a clangd crash.

[llvmbot]

@llvm/issue-subscribers-clangd

Author: Nathan Ridge (HighCommander4)

I would like to backport https://github.com//pull/143087 (which fixes https://github.com//issues/142608) to the 20.x branch.

This is a simple / low-risk fix for a clangd crash.

[HighCommander4]

/cherry-pick 392bd57

[llvmbot]

/pull-request #143344