RFR: JDK-8314389: AttachListener::pd_set_flag obsolete

[Chris Plummer]

On Wed, 16 Aug 2023 08:09:42 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> AttachListener::pd_set_flag is the same across platforms (always returning JNI_ERR ). So it can be centralized or removed.

Marked as reviewed by cjplummer (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/15304#pullrequestreview-1582909269