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

[Gábor Horváth via cfe-commits]

Xazax-hun wrote:

Oh, never mind. My bad, I think the shape of the CFG with the throw should be fine! So relying on `hasNoReturnElement` for the noreturn case should solve the problem. 

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