[foreign-abi] RFR: 8248499: Add methods to allocate off heap arrays from Java arrays

[Athijegannathan Sundararajan]

On Mon, 29 Jun 2020 19:29:08 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> This patch adds methods to NativeScope which allow clients to allocate off-heap arrays from Java on-heap arrays.
> 
> While in most cases the code for copying is straightforward, we have to take into account endianness mismatches (in
> case the user wants to store the array elements off-heap in an endianness that doesn't match that of the platform).
> To allow for that, I've added a new implementation method in AbstractMemorySegmentImpl, which is the same as
> `copyFrom`, but adds the byte swap (a wrapper around `Unsafe::copySwapMemory`).

Looks good

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Marked as reviewed by sundar (Committer).

PR: https://git.openjdk.java.net/panama-foreign/pull/222