[clang] [LifetimeSafety] Fix crash on ternary operator when one of the expressions is `throw` (PR #190345)

[Gábor Horváth via cfe-commits]

https://github.com/Xazax-hun commented:

This looks great! This is very close to what I had in mind. I added one inline comment, I wonder if you can simplify the implementation a bit based on that. 

https://github.com/llvm/llvm-project/pull/190345