[foreign-memaccess+abi] RFR: Fix bug in hashCode after JDK-8291473 [v2]

[Maurizio Cimadamore]

On Tue, 9 Aug 2022 12:49:03 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> Looks good.
> 
> Does it seem useful to add a test for this?

I've added a test which is derived from the existing tests for `equals()`. I've verified that the new test fails with the unpatched code.

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PR: https://git.openjdk.org/panama-foreign/pull/701