Issue created by Wayne Thornton: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5648



## Summary

`_CPU_Spin_wait()` is an assembly function which prevents aggressive 
speculative execution by the CPU during spin-wait loops. Added benefit is 
reduction of thermal load. 

Similar architecture-specific assembly functions will be needed for other 
RTEMS_SMP capable BSPs.


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