[Mono-dev] PR944 - Improve COM error handling

[Eberhard Beilharz]

Hi,

To revive one of my old pull requests: #944 implements some missing
pieces related to COM error handling. Namely it sets the error info in
GetHRForException() and converts the HRESULT values to managed exceptions.

https://github.com/mono/mono/pull/944

Thanks,
    Eberhard