Release Note: Obsolete -XX:UseAdaptiveGCBoundary

The VM option `UseAdaptiveGCBoundary` is obsolete. Use of this option will produce an obsolete option warning but will otherwise be ignored.

This option was previously disabled by default, and enabling it only had an effect when also using `-XX:+UseParallelGC`. Enabling it was intended to provide a performance benefit for some applications. However, it has been disabled by default for a long time because of crashes and performance regressions.