SPECjvm2008-XML.validation-ParGC perf regressions in 10-b40 (all platforms)

With 10-b40, SPECjvm2008-XML.validation-ParGC is showing 1%-3% regressions across all platforms (Linux-x64, Windows-x64, Solaris-SPARC, Mac-x64). Linux, SPARC, and Windows show the clearest indication, but regressions appear across all platforms.

The regressions reproduce in:
• Triage (ie, re-run on the same machine)
• Re-triage (ie, run on a different machine)

The regressions hold through at least b42.

JVMswap results indicate the cause is in the JVM.