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

[Sam Clegg via llvm-commits]

sbc100 wrote:

> @sbc100 Could I get some help cleaning this PR up and adding CLI arguments to influence these variables? I've tried a few times the last few months but don't seem to be familiar enough with the codebase to know how.

To add new command line flags you would edit `lld/wasm/Options.td` to add your new flags and then `lld/wasm/Config.h` to add a place to store then update `readConfigs` in `lld/wasm/Driver.cpp`

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