The AArch64 YIELD instruction affects processors that support
symmetric multithreading, while on other implementations (which
are the majority on the market) it is equivalent to NOP, thus
failing to achieve the desired delay effect inside uv__async_spin().
Instead, use the ISB instruction, following one of Arm's
recommendations [1].
[1] https://community.arm.com/arm-community-blogs/b/architectures-and-processors-blog/posts/multi-threaded-applications-arm
Signed-off-by: Anton Kirilov <anton.kirilov@arm.com>
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