[clang] [clang][lex] Fix assertion in dependency directives lexing (PR #229219)

[Corentin Jabot via cfe-commits]

https://github.com/cor3ntin commented:

This change needs a release note.
Please add an entry to `clang/docs/ReleaseNotes.md` in the section the most adapted to the change, and referencing any Github issue this change fixes. Thanks!

https://github.com/llvm/llvm-project/pull/229219