Just wbinv if both PREREAD and PREWRITE are set. In PREREAD, just invalidate the cache lines, and do not write back them, if the buffer is properly aligned.
Just wbinv if both PREREAD and PREWRITE are set.
In PREREAD, just invalidate the cache lines, and do not write back them, if
the buffer is properly aligned.

Approved by:	re (blanket)

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