Document RISC-V d and f extensions - #2355
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These are being stabilized in rust-lang/rust#156188 as cfg-only features. It is a little odd to list them here in the target_feature attribute section since they can't be used with the attribute, but I think it makes sense to keep things together. Perhaps in the future we may consider breaking these lists out into a separate section and rearrange things.
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This re-lands #2274, except that
eis not included this time anddandfare fully stabilized, not just as cfg-only features. (The features are restricted, they cannot be disabled/enabled on some targets. But the same is true for e.g. SSE and neon and I don't think it is reflected here.)The corresponding rustc PR is rust-lang/rust#161385.