Functions with out params don't get them correctly set from JS with ASYNCIFY=2

**Version of emscripten/emsdk:**
3.1.44

**Failing command line in full:**
See https://github.com/emscripten-core/emscripten/pull/19988

Calling emscripten_idb_exists (or any imported function with out params) fails to set its out param to the correct value. The value stays the same as it was before the call.