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

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GkvJwa wrote:

> > This case(new and delete object) I think we should probably fix the EH numbering algorithm, This does not conflict with This PR
> 
> I argued throughout this PR that "fixing this in EH numbering" is not optimal since mixing SEH with C++ unwinding is generally not allowed in MS C++ and only seems to be supported by Borland C++. In the latter case I do not know how unwinding is generated (e.g. which personality is chosen).
> 
> What i noticed though: even if we mark the dtor as virtual for the delete sample there is still a scope begin+end. That is also true if we delete the delete call and just have the ctor present. Since this is legal in MS C++ I guess one can argue that we should indeed respect c++ scope begin/end intrinsics in the `calculateSEHStateForAsynchEH` numbering algo.

Yes, because using MSVC is effective. impl can be discussed further.

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