[clang] [LifetimeSafety] Overhaul CFG and analysis to also work with trivially destructed temporary objects (PR #177985)

[Abhinav Pradeep via cfe-commits]

AbhinavPradeep wrote:

> I really like this direction but I wonder if it would make sense to split this up in 2 PRs. One for the CFG and one for the analysis.

My only worry is that the analysis-related changes are ~30 lines of changes I think. So it might be too small as a meaningful PR maybe? A mjority of the changes in this PR itself are to the CFG matching test suite, the core functionality changes I think are ~200 lines. What are your thoughts on splitting this PR @usx95 

https://github.com/llvm/llvm-project/pull/177985