RFR: 8366854: Extend jtreg failure handler with THP info

[Stefan Karlsson]

I propose that we also dump /proc/meminfo, /proc/vmstat, and /sys/kernel/mm/transparent_hugepage/{enabled, defrag} from the failure handler.

This information has been helpful when investigating a failure where there was an unexpected lack of transparent huge pages.

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Commit messages:
 - 8366854: Extend jtreg failure handler with THP info

Changes: https://git.openjdk.org/jdk/pull/27086/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27086&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366854
  Stats: 11 lines in 1 file changed: 11 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27086.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27086/head:pull/27086

PR: https://git.openjdk.org/jdk/pull/27086