RFR: Check explicitly for affiliation when updating references

Thu May 27 00:12:22 UTC 2021

On Wed, 26 May 2021 20:37:21 GMT, William Kemper <wkemper at openjdk.org> wrote:

> It's possible for a mutator allocation to 'activate' a region before setting the affiliation, which would trip the assert here (or worse, miss the assert and then go off the rails).

Marked as reviewed by zgu (Committer).

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PR: https://git.openjdk.java.net/shenandoah/pull/47