Add some dummy logic to print IR to HLSL

- Change IR instructions to just hold an integer opcode instead of a pointer to the "info" structure

- Externalize definition of IR instructions to a header file, and use the "X macro" approach to allow generating different definitions

- Add notion of function types to the IR, so that we can easily query the result type of a function

- Add some convenience accesors to allow walking the IR in a strongly-typed manner (e.g., iterate over the parameters of a function)
  - TODO: these should really be changed to assert the type of things, as least in debug builds

- Add very basic logic to `emit.cpp` so  that it can walk the generated IR and start printing it back as HLSL
  - This isn't meant to be usable as-is, but it is a step toward where we need to go

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