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_opt/src/sroa.rs

@@ -180,7 +180,9 @@ pub fn sroa(
         .collect();
     println!("{:?}", to_sroa);
 
-    // Perform SROA.
+    // Perform SROA. TODO: repair def-use when there are multiple product
+    // constants to SROA away.
+    assert!(to_sroa.len() < 2);
     for (constant_node_id, constant_id) in to_sroa {
         // Get the field constants to replace the product constant with.
         let product_constant = constants[constant_id.idx()].clone();