Probably fix #2016: Sort ports when compiling refs

[sampsyo]

This is a really tiny change to force an ordering on the "inlined" ports when compiling ref cells, to address #2016.

Recall that compiling ref cells (which happens in compile-invoke, despite the name) involves creating ports in the "host" component to mirror those in the ref cell it contains. Those ports are created by an ir::Rewriter, which produces a HashMap, which is of course nondeterministic. The strategy here is to just take those randomly-ordered ports and sort them before we add them to the "host" component, yielding deterministic IR from this pass.

I don't know if this is the best way, but it is at least a way.

[rachitnigam]

We generally use LinkedHashMap instead of sorting for these cases in other parts of the code base. Unclear which solution is better overall since we don't care about insertion order; just a stable order

[rachitnigam]

This is a fine fix for now. Merging!