[clang] [clang][Lex] Collapse relative extern module paths when recursing to prevent unbounded path length growth. (PR #193691)

[Yihan Wang via cfe-commits]

yronglin wrote:

> Can I request someone merge this on my behalf? I don't have the capability.

Thanks for the patch! Merged.

https://github.com/llvm/llvm-project/pull/193691