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/ir.rs

@@ -659,6 +659,14 @@ impl Type {
         self.is_bool() || self.is_fixed() || self.is_float()
     }
 
+    pub fn is_product(&self) -> bool {
+        if let Type::Product(_) = self {
+            true
+        } else {
+            false
+        }
+    }
+
     pub fn is_array(&self) -> bool {
         if let Type::Array(_, _) = self {
             true