[Mono-dev] COM Interop Performance Patch

[Jonathan Chambers]

Hello,
     Attached is a patch that removes the managed transition (and object
creation) when getting a COM Interface from a runtime callable wrapper. This
makes mono COM Interop about 2.5 times slower than MS (an improvement from
10x slower). I also implemented/consolidate the code for
Marshal.ThrowExceptionForHR and Marshal.GetExceptionForHR.

Please review.

Thanks,
Jonathan
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