[clang] [clang][WebAssembly] Handle casted function pointers with different number of arguments (PR #153168)

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juj wrote:

> Yeah, let me be clear here: I see the GLib problem as being a completely separate problem from the one you have. AFAICS this patch doesn't attempt to address your issue at all, and the solutions I'm brainstorming here also don't attempt to address the issue.

Thanks, that makes sense, agreed.

> also for b), have you filed a bug on Chrome with that as a feature request?

I did, though unfortunately it was closed on the basis of being too costly to implement.

I got started on an Emscripten SAFE_HEAP style codegen pass to wrap each generated function pointer dispatch, but it was quite tricky to implement from Emscripten repository side alone.

https://github.com/llvm/llvm-project/pull/153168