RFR: 8253647: Remove dead code in os::create_thread() on Linux/BSD

[David Holmes]

On Fri, 25 Sep 2020 17:06:58 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> Please review this small patch to remove dead code that is left behind by JDK-8078513.
> 
> Test:
> - [x] tier1 on Linux 86_64

Looks good and trivial.
Thanks.

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Marked as reviewed by dholmes (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/361