6a45bd5f77
This PR adds a barrier primitive as `Std.Barrier`. The implementation is mirrored after [the Rust one](https://github.com/rust-lang/rust/blob/b8ae372/library/std/src/sync/barrier.rs) as C++14 does not have barriers yet. |
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| compiler | ||
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| playground | ||
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| common.sh | ||
| lean-toolchain | ||