[jdk11u-dev] RFR: 8314144: gc/g1/ihop/TestIHOPStatic.java fails due to extra concurrent mark with -Xcomp

[Andrew Lu]

I backport this for parity with 11.0.23-oracle.

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Commit messages:
 - Backport 1925508425cf1b2d46173754077a588290253430

Changes: https://git.openjdk.org/jdk11u-dev/pull/2494/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2494&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314144
  Stats: 3 lines in 2 files changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2494.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2494/head:pull/2494

PR: https://git.openjdk.org/jdk11u-dev/pull/2494