RFR: 8331719: Cleanup asserts/code after introducing IsSTWGCActiveMark

[Guoxiong Li]

On Sun, 12 May 2024 09:41:52 GMT, xiaotaonan <duke at openjdk.org> wrote:

> Cleanup asserts/code after introducing IsSTWGCActiveMark

This issue was assigned by @shipilev . Not know whether he had a patch locally. It may be good for him to have a look.

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PR Comment: https://git.openjdk.org/jdk/pull/19208#issuecomment-2107196959