RFR: 8305936: JavaThread::create_system_thread_object has unused is_visible argument

[Alan Bateman]

On Thu, 13 Apr 2023 05:41:31 GMT, David Holmes <dholmes at openjdk.org> wrote:

> Please review this simple cleanup of an unused parameter in  `create_system_thread_object`. Details are in JBS.
> 
> Testing: tiers 1-3
> 
> Thanks.

Marked as reviewed by alanb (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/13455#pullrequestreview-1382703726