RFR: 8350889: GenShen: Break out of infinite loop of old GC cycles part2

[Kelvin Nilsen]

A recent commit failed to address all paths by which an infinite loop of old GC cycles might occur.  This new PR handles one other case related to the original problem.

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Commit messages:
 - Cancel old GC triggers when old GC starts/resumes
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - Merge branch 'openjdk:master' into master
 - ... and 20 more: https://git.openjdk.org/jdk/compare/4a02de82...4ebb3aaf

Changes: https://git.openjdk.org/jdk/pull/24106/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24106&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8350889
  Stats: 2 lines in 2 files changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24106.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24106/head:pull/24106

PR: https://git.openjdk.org/jdk/pull/24106