[wasm-split] Increase in wasm initialization time after split

Please include the following in your bug report:

**Version of emscripten/emsdk:**
```
emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 3.1.35 (a90c5abb489c516f59c0d16864d953d4bedd37da)
clang version 17.0.0 (https://github.com/llvm/llvm-project 6865cff8ea8b07d9f2385fd92cecb422404f0f35)
Target: wasm32-unknown-emscripten
Thread model: posix
InstalledDir: ~/3.1.35/emsdk/upstream/bin
```

We have recently integrated module splitting in our code base with the aim of improving wasm download time. We were able to get primary module which is around 1 MB less in size that of the original module (8.5 MB). This led to decrease in wasm download time but the time after wasm download till the first line of `main` function is hit, has increased. This increase ranges from 10-20 ms. Is this increase expected? Does this have something to do with increase in the size of indirect table in primary split?