[nem-en] access to type and function call resolution information in a macro

[Kannan Goundan]

I'm wrote a macro that takes:

   FancyAssert(a < 10)

And produces something like:

   unless (a < 10)
      throw Exception("Failed: (a < 10), a = " + a.ToString());

Right now, it works with a 'PExpr' tree, but I currently have some
issues that could be resolved if type information and function call
resolution information were available.  Any ideas?

- Kannan

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