Add the ability to have vritual nodes that consume more than one
'slot'. In the top file, you can how give' the virtual node's type as type:count - sim:5, for example. If you give no count, it defaults to one. The idea here is to allow a pre-pass to assign to 'coarsen' the virtual graph. This pre-pass could, for example, combine several virtual or simulated nodes into one so that assign has a simpler virtual graph to work with.
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