[foreign] RFR: 8229752: Use of pointer from scope.allocateArray with 0 element cause IllegalStateException

[Henry Jen]

Hi,

Please review the webrev[1] for the fix is to make sure

1. NULL pointer is returned when allocate size 0, this is to make sure the pointer is with null layout, so that addr() won’t fail because of size check.
2. Pointer.copy to accept NULL pointer when copying 0 bytes. This make sure the interoperability with any other pointers when 0 bytes is needed.

Cheers,
Henry

[1] https://cr.openjdk.java.net/~henryjen/panama/8229752/0/webrev/