[jdk13u-dev] RFR: 8185005: Improve performance of ThreadMXBean.getThreadInfo(long ids[], int maxDepth)

[Sergey Nazarkin]

I'd like to backport this case for parity with jdk11. The patch need some fixes similar to described here http://mail.openjdk.java.net/pipermail/jdk-updates-dev/2020-January/002377.html, except move of primitive_hash is not necessary.

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Commit messages:
 - Redo previous fix and remake as jdk11 did
 - Build fix with ConcurrentHashTable template args
 - Backport 6ccf3351d7eef4b6a2ef8b33e4173416cfdcefd5

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/266/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=266&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8185005
  Stats: 336 lines in 5 files changed: 326 ins; 1 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/266.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/266/head:pull/266

PR: https://git.openjdk.java.net/jdk13u-dev/pull/266