[lld] ELF: Introduce --randomize-section-padding option. (PR #117653)

[via llvm-commits]

pcc wrote:

> I love the idea and I want to use it already to work around some problems I'm seeing.
> 
> If I wasn't already aware of the feature and I was scanning through a list of command-line options then I'm not sure I'd catch on to what this is from the name. I think `shuffle` implies reordering and it looks like there's no reordering going on here. `--randomize-padding` might be clearer. And `--randomize-section-padding` might be clearer still. Brevity is overrated!

Okay, I renamed it to  `--randomize-section-padding`.

https://github.com/llvm/llvm-project/pull/117653