8055111: [TESTBUG] jdk.testlibrary.Utils.removeGcOpts doesn't remove -Xconcgc
Reviewed-by: jmasa, brutisso, sla
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<excludeList>
<test id="JDK-8014647.js" />
<test id="javaclassoverrides.js" />
<test id="JDK-8020809.js" />
</excludeList>