Asyncify ignore & debug flag

**Edit**: for point two `--profiling` seems to be helping digging out the issue, but I'm still a bit confused as to why debugging flag would make things work.

I am currently working on a codebase where I `ASYNCIFY_IGNORE_INDIRECT` then `ASYNC_ADD` the functions/methods needed. This works as intended when `-g3` or higher is set, but fails with:

```
(index):1 exception thrown: RuntimeError: function signature mismatch,RuntimeError: function signature mismatch
at emscripten::internal::Invoker::invoke(void (*)(unsigned int), unsigned int) (http://localhost:8000/byuu-web.wasm:wasm-function[3898]:0x23f8a5)
at ret. (http://localhost:8000/byuu-web.js:9126:35)
at Object.finishContextSwitch (http://localhost:8000/byuu-web.js:9309:11)
at Object.trampoline (http://localhost:8000/byuu-web.js:9283:20)
at Object.ret. [as dynCall_v] (http://localhost:8000/byuu-web.js:9138:30)
at browserIterationFunc (http://localhost:8000/byuu-web.js:5492:30)
at Object.runIter (http://localhost:8000/byuu-web.js:5605:13)
at Browser_mainLoop_runner (http://localhost:8000/byuu-web.js:5544:26)
```

My questions are:

1. Is it possible that Asyncify relies on debugging information?
2. What would be the best method to go about to investigate these kind of issues?