[jdk11u-dev] RFR: 8281297: TestStressG1Humongous fails with guarantee(is_range_uncommitted)

[Goetz Lindenmaier]

I backport this for parity with 11.0.18-oracle.

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Commit messages:
 - Backport 1ce72eabe54520845d8466c9d3ac07b60597182a

Changes: https://git.openjdk.org/jdk11u-dev/pull/1436/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1436&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8281297
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1436.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1436/head:pull/1436

PR: https://git.openjdk.org/jdk11u-dev/pull/1436