add std.atomic.Op for feature detection #24548
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re: #24528
@andrewrk how's this? :)
I've not reviewed the logic for most targets - it's just copied across verbatim - but I did go through wasm fairly thoroughly, and I added a feature detection for x86 cx8 (equivalent of cx16 on x86_64)
I wasn't entirely sure whether to put this in
std.atomic
orstd.Target
- let me know your thoughts!