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

[Ethan O'Brien via llvm-commits]

ethanaobrien wrote:

Hey @sbc100! Sorry for the delay, I finally got the time to figure out how to write a test. I've added tests for default, an alignmnet of 2, and an alignment of 3

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