std::rt: Implement task yielding. Fix a starvation problem #9507
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bors
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This also includes a fix for yielding from single-threaded schedulers where the scheduler would stop working before its work queue was empty. Fixes the deadlocks that this patch had previously.
flip1995
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[arithmetic-side-effects] Consider references Takes into consideration integer references like `&i32::MAX` because currently things like `let _ = &1 + 0` trigger the lint. changelog: FP: [`arithmetic_side_effects`]: Now ignores references [9507](rust-lang/rust-clippy#9507)
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This also includes a fix for yielding from single-threaded schedulers where the scheduler would stop working before its work queue was empty. Fixes the deadlocks that this patch had previously.