[clang-tools-extra] [clangd] fix crash in include cleaner (PR #99514)

[Nathan Ridge via cfe-commits]

HighCommander4 wrote:

> Looks like I definitely don't understand what's going on. Instead let me try a more conservative fix. This should preserve what the current code is doing and just fix the assertion failure.

Could you say more about what problem you ran into with the first fix approach?

https://github.com/llvm/llvm-project/pull/99514