feat: gc-arena (WIP, does not compile)

src/jit/test.rs

@@ -3,6 +3,7 @@
 extern crate test;
 
 use bumpalo::Bump;
+use gc_arena::Arena;
 use hashbrown::{HashMap, HashSet};
 
 use inkwell::context::Context;
@@ -31,7 +32,6 @@ fn test_expr(expr: &str, expected: Value) {
         prog.symbols.into(),
         prog.symmap.into(),
         prog.consts,
-        Bump::new(),
         jit,
     );
     let env = env(&vm);