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

[Abhinav Pradeep via cfe-commits]

================
@@ -5997,6 +6041,13 @@ static void print_elem(raw_ostream &OS, StmtPrinterHelper &Helper,
     OS << " (Lifetime ends)";
----------------
AbhinavPradeep wrote:

I have it such that for this code we would see the lifetime marker:

```
  ...
  16: (FullExprCleanup collected 3 MTEs: [B1.7], [B1.13], std::allocator<char>())
  ...
```

That is, we print the block index when tracked, and otherwise fall back to pretty printing the sub expression. Does this sound good?

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