benchmark and eventually support MOVDIRI/MOVDIR64B on Sapphire Rapids Xeon

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@pakmarkthub is already working on this.

Since Dec 9, 2022.

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Description

enhancement

from Intel manuals:

Unlike WC stores and stores with non-temporal hint, direct-stores are eligible for immediate
eviction from the write-combining buffer, and thus not combined with younger stores (including direct-stores)
to the same address. Older WC and non-temporal stores held in the write-combing buffer may be combined with
younger direct stores to the same address. Direct stores are weakly ordered relative to other stores. Software that
desires stronger ordering should use a fencing instruction (MFENCE or SFENCE) before or after a direct store to
enforce the ordering desired.
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