LemonBoy 807bb7c03f std: Improve spinloop hint ...

* Add a yield pattern for PowerPC64
* Fix compile error on pre-v6 ARM targets
* Use isb instead of yield on AArch64 to give the CPU a chance to enter
  low-power states.
* Make the hint an inline function, the call overhead can be avoided.

2021-04-30 17:11:03 +02:00

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