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add `core::hint::prefetch_{read, write}_{data, instruction}`
tracking issue: https://github.com/rust-lang/rust/issues/146941
acp: https://github.com/rust-lang/libs-team/issues/638
well, we don't expose `prefetch_write_instruction`, that one doesn't really make sense in practice.
The implementation is straightforward, the docs can probably use some tweaks. Especially for the instruction version it's a little awkward.
r? `@Amanieu`