[clang] [WinEH] Fix crash, object unwinding in the except block (PR #172287)

[via cfe-commits]

GkvJwa wrote:

> I'm not sure this catches all the cases we need to catch; for example, #109576 has a testcase with a new expression.

```
struct A {
  ~A();
};

void f() {
  __try {
    A* a = new A;
    delete a;
  } __finally {
  }
}
```

This is valid in MSVC, and I think this might be the issue that @MuellerMP is fixing.

https://github.com/llvm/llvm-project/pull/172287