I'm not a fan of how we bring this Instant in. I think it'd be worth considering some kind of bevy_platform_support crate which moves things like spin, portable-atomic, critical-section, wasm-time, etc. into a single spot. It'd be more focussed than bevy_utils, and possibly clean up some of the cfg(...) noise we have across Bevy.

Originally posted by @bushrat011899 in #16874 (comment)