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style: Make Rust static atoms able to be used in const contexts.
I see atom dropping code generated in release builds for stuff like dropping the "class" atom here: https://searchfox.org/mozilla-central/rev/4df8821c1b824db5f40f381f48432f219d99ae36/servo/components/style/gecko/wrapper.rs#592 That is silly, and I hope making Atom be able to be used in const context will help the compiler see that yeah, we're not doing anything interesting and the atom shouldn't get dropped. It also allows us to get rid of a few lazy_static!s, so we should do it anyway. In order to accomplish this, compute the offset into gGkAtoms manually instead of going through the static_atoms() array and then back to the byte offset. Differential Revision: https://phabricator.services.mozilla.com/D55039
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