Feature request: suppress `undefined symbol` warning for specific symbols

[hoodmane]

There are some symbols that I manually add to wasmImports in the instantiateWasm hook. I would like to be able to suppress warnings about these being missing specifically, without turning off all missing symbol warnings.

[RReverser]

Isn't that the one we talked about recently, the one you can use Stub Libraries for?

[sbc100]

Do you mean you want some kind of flag like -sALLOW_UNDEFINED=foo,bar,baz and then a way to inject those symbols at runtime? With and an error at runtime if they are missing then?