perf: use jemalloc as global allocator (#18957)

Follow up to https://github.com/denoland/deno/pull/18875 that enables
`jemalloc` as a global allocator for the Deno CLI.

cli/napi/async.rs

@@ -24,7 +24,8 @@ fn napi_create_async_work(
     execute,
     complete,
   };
-  *result = transmute::<Box<AsyncWork>, _>(Box::new(work));
+  let work_box = Box::new(work);
+  *result = transmute::<*mut AsyncWork, _>(Box::into_raw(work_box));
   Ok(())
 }