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

[Amr Hesham via cfe-commits]

AmrDeveloper wrote:

> This looks good. I just have a few minor concerns. Are you going to fix the remaining XFAIL cases?

I am thinking of fixing the remaining 2 XFAIL in follow-up PR's to not make this PR 1.5K LoC :D 

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