RTEMS | cpukit: Create DHRL Library for DRAM Latency Mitigation (!1193)

[Gedare Bloom (@gedare)]

Gedare Bloom commented on a discussion on cpukit/include/rtems/dhrl.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1193#note_150443

 > +/* SPDX-License-Identifier: BSD-2-Clause */
 > +
 > +/**
 > + * @file
 > + *
 > + * @brief Deterministic Hedged Read Library (DHRL) Public API
 > + *
 > + * @note This library is explicitly constrained to x86_64/amd64 architectures.

We have facilities already for cache management, they should be preferred and extended if necessary: https://docs.rtems.org/docs/main/c-user/cache/introduction.html

I would also prefer generic solutions rather than specifically labelled "DHRL" solutions, such as `_CPU_Relax()` or maybe in this case it is more like `_CPU_Pause_speculation`?

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1193#note_150443
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