[clang] Fix #99858 (PR #99859)

[Ahmet Faruk Aktaş via cfe-commits]

ahfakt wrote:

I tried to represent the error with a sample code but can not reproduce. It may be removed because of unused template function optimization. In my project it is in a template library which is not a compiled context. I just wanted to point the issue so someone who is experienced in the project can do a more detailed development on potential similar issues(all references to findInstantiationOf function). It is an obvious missing null check bug. If i have a free time i will try to provide test case.

Thanks for your quick response.

https://github.com/llvm/llvm-project/pull/99859