[llvm] [llvm] Validate Parent object before dereference (PR #157460)

[James Henderson via llvm-commits]

jh7370 wrote:

> > LGTM. Do you need me to merge this for you?
> 
> Yes, I think I couldn't merge into project myself. Thank you!

Done. Please keep an eye open for notification emails from the build bots. The failures probably won't be related to your change, but it's always possible!

https://github.com/llvm/llvm-project/pull/157460