[lld] [WIP] wasm-ld: Implement function pointer alignment (PR #105532)

[Ethan O'Brien via llvm-commits]

ethanaobrien wrote:

Thanks! Before I do this, do you have opinions on what the flags should be?

>From what I've been able to tell, to mimic how `align-functions` works on other targets, we would need to set padding to a static value of `1`, and set alignment to the argument, though should the flag be `align-functions`? Should both padding and alignment be configurable?

https://github.com/llvm/llvm-project/pull/105532