Vector API - Non Temporal Hints

[Michaël Figuière]

Hi,

The Vector API currently doesn't offer a way to add a non temporal hint
when storing a vector into memory whereas both x86 and ARM instruction sets
offer such capability, at least for continuous, non-scattered storage. As
the API has been introduced with large dataset manipulation in mind, having
such an option could be a valuable way to grab some performance improvement
without much effort for both the end developer and the OpenJDK developers.

An obvious way to add such a capability would be to overload the relevant
intoXXX() methods in each XXXVector class to add an extra boolean
nonTemporal argument. A convenient aspect of this addition is that it
doesn't alter the semantic of the storage method as it's just a performance
hint. Thus supporting it for each present and future architecture can be
done in a best effort manner.

Best,
Michaël
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