I saw this function appear in the profiles at #17329.
It was under set_device, which isn't a Stylo path, but probably worth there
anyway.
This reduces the reported overhead of RulesIterator::next in perf from ~8% to
0.46%
This file has become quite bloated lately. This commit deletes that file in
favor of a set of submodules.
The only noticeable change apart from code move, is converting deep_clone_foo
methods into a trait.
It also unifies logic related to different style rules in the same place.
There's some missing work, specially related to font-face and counter-style, but
I think this is worth landing in the meantime.
