Make all the function bodies executable, not just the start function.

lib/execute/src/lib.rs

@@ -84,7 +84,7 @@ pub fn execute(
     let start_index = compilation.module.start_func.ok_or_else(|| {
         String::from("No start function defined, aborting execution")
     })?;
-    let code_buf = &compilation.functions[start_index];
+    for code_buf in &compilation.functions {
         match unsafe {
             protect(
                 code_buf.as_ptr(),
@@ -100,6 +100,9 @@ pub fn execute(
                 ))
             }
         }
+    }
+
+    let code_buf = &compilation.functions[start_index];
 
     let vmctx = make_vmctx(instance);