[clang] [CIR] Represent Cleanups with Cleanup scopes (PR #180276)

[Andy Kaylor via cfe-commits]

andykaylor wrote:

> This is the current CIR generated when CleanupScope is used inside a ternary
> I am thinking to create a temp alloca to store the result of the call and load it after cleanup to use it in the yield of the ternary.
> 
> What do you think? @andykaylor

Can you detect, in a general way, all values that are created in a cleanup scope but referenced outside the scope? A temporary variable seems like a reasonable solution, as long as the implementation is clean and flexible.

https://github.com/llvm/llvm-project/pull/180276