How to allocate 2 or more GB ?

The size parameter to the allocation is defined as an int. This precludes allocations of 2 or more GB in a single call. At the very least, the 'int cb' should have been a 'uint cb'.

I would also argue that in 64-bit addressing it should be a long (or a ulong)... welcome to the 64-bit world.

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* Content: [Marshal.AllocCoTaskMem(Int32) Method (System.Runtime.InteropServices)](https://docs.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.marshal.alloccotaskmem?view=netframework-4.7.2)
* Content Source: [xml/System.Runtime.InteropServices/Marshal.xml](https://github.com/dotnet/dotnet-api-docs/blob/master/xml/System.Runtime.InteropServices/Marshal.xml)
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