Misc. improvements

• Emit non-zero array constants properly
• Emit only actually used array constants per runtime wrapper
• Juno CLI
• Use repr(C) structs for product types
• Minimal implementation of SROA
• TODO: inlining, codegen cast, intrinsics, dynamic constant math

hercules_ir/src/dom.rs

@@ -244,7 +244,7 @@ fn preorder(subgraph: &Subgraph, root: NodeID) -> (Vec<NodeID>, HashMap<NodeID,
     let parents = HashMap::new();
 
     // Order and parents are threaded through arguments / return pair of
-    // reverse_postorder_helper for ownership reasons.
+    // preorder_helper for ownership reasons.
     preorder_helper(root, None, subgraph, order, parents)
 }