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

[Utkarsh Saxena via cfe-commits]

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+// RUN: %clang_cc1 -fsyntax-only -fcxx-exceptions -Wlifetime-safety -Wno-dangling -verify %s
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usx95 wrote:

Can we move these tests to `warn-lifetime-safety.cpp`.

The code here requiring exceptions can be added within a `ifdef`

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