asyncify: identify functions missing from whitelist

[Beuc]

Hi,

As discussed at #9257 (comment) and confirmed at emscripten-discuss it would be useful to identify what function is missing from ASYNCIFY_WHITELIST, in a manner similar to what Emterpreter does (full stack trace when sleeping or resuming inappropriately).
Opening an issue as requested.

This is particularly useful in complex code with indirect calls :)

[Beuc]

In addition, formatting the function names appears to be error-prone (discussion recommends grepping the wasm disassembly) so it would save time to provide function names in a format recognized by ASYNCIFY_WHITELIST, if possible :)

[gabrielcuvillier]

I agree with this. The current approach I am using is to use Emterpreter first to find out the functions to whitelist at runtime, demangle them, then switch back to ASYNCIFY...

[stale]

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