Add const unstability attributes #835
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These are needed for rustc to be able to correctly handle stability of constness of intrinsics. Without either `rustc_const_unstable` or `rustc_const_stable` an intrinsic is not const evaluable at all.
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These are needed for rustc to be able to correctly handle stability of constness of intrinsics. Without either
rustc_const_unstableorrustc_const_stablean intrinsic is not const evaluable at all.related: rust-lang/rust#61495