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

[James Y Knight via cfe-commits]

jyknight wrote:

I'm not sure if this will cause practical issues, but this isn't actually a _correct_ change. The path "a/../b" does not always refer to the same file as the path "b". In particular, when "a" is a symlink.

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