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_cg/src/common.rs

@@ -29,6 +29,7 @@ pub(crate) struct FunctionContext<'a> {
     pub(crate) llvm_types: &'a Vec<String>,
     pub(crate) llvm_constants: &'a Vec<String>,
     pub(crate) llvm_dynamic_constants: &'a Vec<String>,
+    pub(crate) type_sizes_aligns: &'a Vec<(Option<usize>, usize)>,
     pub(crate) partitions_inverted_map: Vec<Vec<NodeID>>,
 }