RFR: 8299237: add ArraysSupport.newLength test to a test group

[Roger Riggs]

On Thu, 22 Dec 2022 19:37:12 GMT, Stuart Marks <smarks at openjdk.org> wrote:

> This test isn't part of any test group, so it isn't being run regularly! I'm adding it to the jdk_util_other test group.

LGTM;  Test fixes are ok for JDK 20 backport.

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Marked as reviewed by rriggs (Reviewer).

PR: https://git.openjdk.org/jdk/pull/11769