Make code NativeAOT compatible #1609
                
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I know that C# files are autogenerated, but in case
somebody what to use it without waiting for change in code gen tooling.
This PR has 3 changes, all of them trivially can be updated in the codegen:
Marshal.SizeOf(Type)switched toMarshal.SizeOf<T>()Marshal.PtrToStructure(IntPtr, Type)toMarshal.PtrToStructure<T>(IntPtr)Marshal.PtrToStructure<string>(IntPtr)is gross error, and should be mapped toMarshal.PtrToStringAnsi(IntPtr)This and #707 should make life of C# developer, amenable and close #638 and #472.