[jdk17u] RFR: 8271215: Fix data races in G1PeriodicGCTask

[Paul Hohensee]

On Tue, 31 Aug 2021 16:20:22 GMT, Larry-N <duke at openjdk.java.net> wrote:

> Tested with tier1

This is a clean backport, so doesn't need a review. The issue has been tagged with both jdk17u-fix-request and jdk17u-fix-yes, so can now be integrated. Use the '/integrate' command as described above.

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PR: https://git.openjdk.java.net/jdk17u/pull/51