RFR: 8302125: Make G1 full gc abort the VM after failing VerifyDuringGC verification

[Thomas Schatzl]

Hi all,

  can I get reviews for this small fix that makes the VM fail if there has been a verification failure via VerifyDuringGC during full gc in product mode?

Thanks,
  Thomas

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Commit messages:
 - initial version

Changes: https://git.openjdk.org/jdk/pull/12487/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12487&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302125
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/12487.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12487/head:pull/12487

PR: https://git.openjdk.org/jdk/pull/12487