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_150587

 > +/* 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.

I'll take another pass through it.

If the hardware must support those features, I would make those features explicitly required, and break/prevent any attempt to build the library if those features are missing. This can be done through a combination of the `spec/build` and the CPU port macro definitions:
* if the `_CPU_Pause_speculation` is not defined, should an attempt to compile fail?
* You can make the `spec/build/cpukit/libdhrl.yml` depend on RTEMS_SMP.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1193#note_150587
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