[Mono-dev] Simple method devirtualization patch

[Rodrigo Kumpera]

The following patch perform simple devirtualization based on the sealed flag
of methods and types.

The patch makes pystone 4% faster with IronPython 2.0 and 1% faster with
IronPython 1.0. It should improve other benchmarks as well, since it main
contribution is statically dispatching delegate.Invoke. To provide more
broad results a sse pass that perform type propagation is needed.

The only thing I'm not sure about this patch is if it should handle remoting
wrappers is some sort of way.
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