Emit pointer-type parameters as out params

The IR encodes `out` and `in out` function parameters as pointer types, so the emit logic needs to handle it. We had code to handle translation of pointers types into `out` declarations for function *declarations* but weren't handling it for function *definitions*.

This change unifies the logic so that it is shared by function definitions and decalrations.

This change does *not* deal with the following issues that need to be addressed sometime soon-ish:

- We currently always translate pointers into `out`, even if they should be `in out`. This is obviously wrong.

- If/when we eventually have targets that support true pointers (e.g., CUDA, NVIDIA OpenGL, etc.) we'll need a way to tell the difference between an `in` pointer parameter, and an `out` parameter.

Both of these issues are meant to be addressed by having a few special cases of pointer types, for the `out` and `in out` cases, and only translating those (not all pointers). We need to plumb those through the IR more completely, but I'm not dealing with that here.

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