[DotGNU]Implementing UnmanagedMarshal.DefineCustom()

[Marcus]

I chatted with Rhys yesterday about adding a non-MS extension to the 
UnmanagedMarshal class (in System.Reflection.Emit). The method would permit a 
specifying a custom marshaler for a parameter in methods that are defined at 
runtime via S.R.E.

The modifications to UnmanagedMarshal are the addition or two private string 
fields, marshalCookie and marshalType, the DefineCustom method itself, and an 
addition case to the switch statement in ToBytes().

I'm not sure where to go from here, but I'm attaching a patch to this message 
for people to look at.

Marcus

UnmanagedMarshal.patch
Description: Text Data