[jdk11u-dev] RFR: 8279662: serviceability/sa/ClhsdbScanOops.java can fail due to unexpected GC

[Goetz Lindenmaier]

I backport this for parity with 11.0.19-oracle.

I resolved the Copyright, will mark as clean.

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Commit messages:
 - Backport fe0118f8040ce7e5e3d605942443e3a5d442fa92

Changes: https://git.openjdk.org/jdk11u-dev/pull/1776/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1776&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8279662
  Stats: 40 lines in 1 file changed: 22 ins; 2 del; 16 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1776.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1776/head:pull/1776

PR: https://git.openjdk.org/jdk11u-dev/pull/1776