[clang] [ASTMatchers] Fix classIsDerivedFrom for recusrive cases (PR #67307)

[Caslyn Tonelli via cfe-commits]

Caslyn wrote:

Hi @sam-mccall - thank you, and apologies for the false alarm.

After closer inspection, it looks like https://github.com/llvm/llvm-project/issues/66114#issuecomment-1732319259 explains the particular failures we're seeing. Indeed, no relation to this PR - please consider this matter closed here.

https://github.com/llvm/llvm-project/pull/67307