RFR: 8341513: Remove the unused thread_type field from OSThread

[David Holmes]

On Wed, 16 Oct 2024 10:05:25 GMT, Amit Kumar <amitkumar at openjdk.org> wrote:

> This trivial PR cleans up ` thread_type` field. 
> 
> Build is fine on s390x-linux. I have tested on local system Mac-M1 but it failed due to this issue: [JDK-8340341](https://bugs.openjdk.org/browse/JDK-8340341)

Functional changes are good.

Please run GHA on your branch so that all builds are tested, and successful.

Thanks

src/hotspot/os/aix/osThread_aix.cpp line 3:

> 1: /*
> 2:  * Copyright (c) 1999, 2024, Oracle and/or its affiliates. All rights reserved.
> 3:  * Copyright (c) 2012, 2024 SAP SE. All rights reserved.

@offamitkumar  do you work for SAP? If not then please do not modify their copyright notice. Thanks for updating the Oracle one's as I requested.

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PR Review: https://git.openjdk.org/jdk/pull/21532#pullrequestreview-2374438514
PR Review Comment: https://git.openjdk.org/jdk/pull/21532#discussion_r1804285545