[SPLIT_MODULE] Fix wasmRawExports to actually be the raw exports. NFC

[sbc100]

We don't want the raw exports include things like
Asyncify.instrumentWasmExports or relocateExports. They should be the actual raw exports.

See #25621

[tlively]

Is there a test we can write for this?

[inolen]

It would also be useful to not have this behind the SPLIT_MODULE ifdef (at least for my personal use).

[sbc100]

It would also be useful to not have this behind the SPLIT_MODULE ifdef (at least for my personal use).

Sadly that would increase codesize for everyone so we don't want to do that by default if we can help it.

Have you looked into using wasmImport + -sMAIN_MODULE=2 (that latter will inject raw exports that you want into wasmImports on load).

[sbc100]

Is there a test we can write for this?

Its a little tricky because for a couple of reasons:

1. We would need to make the test sensitive to having JS wrapper around the imports.
2. We would need to make sure the imports we split out have some kind of JS wrapper installed.

I will have a go but if its not easy I might just request that we land this as a "does not regress" change :)

[kripken]

I don't feel strongly either way about testing here.