RFR: 8276107: Preventive collections trigger before maxing out heap

[Thomas Schatzl]

Hi all,

  can I have reviews for this small fix for an issue where preventive gcs that are supposed to prevent evacuation failure were also started if there were only not enough free committed regions available but more than enough uncommitted regions to expand the heap (to avoid the evacuation failure).

Testing: gha

Thanks,
  Thomas

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Commit messages:
 - Do not start preventive gc before completely out of regions

Changes: https://git.openjdk.java.net/jdk/pull/6160/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6160&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276107
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6160.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6160/head:pull/6160

PR: https://git.openjdk.java.net/jdk/pull/6160