[lld] [llvm] [MC] Honour alignment directive fill value for non-intel (PR #100136)

[Sam Elliott via llvm-commits]

lenary wrote:

If you think backporting would be useful I'm happy for that to happen. I don't really want to catch the intel backend maintainers by surprise if this does have strange performance effects, but I guess they should have had some time to work out whether this has an impact or not already and they haven't commented. 

https://github.com/llvm/llvm-project/pull/100136