[llvm] [DebugInfo] Helper method for finding the deepest inlining location (PR #161696)

[Akshay Deodhar via llvm-commits]

akshayrdeodhar wrote:

> Could you add some unittest coverage?

I'm planning to add a test to DebugInfoTest.cpp- does that work? 

https://github.com/llvm/llvm-project/pull/161696