RFR: Fix builds that do not have Shenandoah or other GCs

Wed Feb 17 10:18:07 UTC 2021

On Wed, 17 Feb 2021 10:12:23 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

> Looks good. I wonder if this should go upstream?

Oh wait, this file is in upstream! So we only fail Shenandoah builds, because we touch ShenandoahGCMode that is not available. Other GCs expose at least some symbols to make this code work. Let me do a more pointed fix.

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PR: https://git.openjdk.java.net/shenandoah/pull/16