Make 'instantiateWasm' callback resolve the result return from 'recei…

[gogogoghost]

In js output content.

When ASYNCIFY enabled, wasmExports modified by Asyncify.instrumentWasmExports. source

But when Module['instantiateWasm'] used. The createWasm function will always resolve the original wasmExports. source.

It will case crash when async C++ function rewind.

So I make instantiateWasm callback resolve the result return from receiveInstance.

[sbc100]

Tanks for the fix!

Do you think we can update one of the existing tests to cover this? Maybe test_instantiate_wasm in test_other.py

[gogogoghost]

I have just updated the test unit. And this issue only affects when EXPORT_ES6 enabled.

When EXPORT_ES6 disabled. createWasm called after wasmExports defined.

var wasmExports;
createWasm();

wasmExports can be updated in createWasm.

When EXPORT_ES6 enabled. wasmExports assigned by the return value of createWasm.

var wasmExports = await createWasm();