RFR: 6911: Third Party Upgrade to HdrHistogram 2.1.12

[Suchita Chaturvedi]

As part of this enhancement, the third party HdrHistogram is upgraded from 2.1.11 to 2.1.12 (latest).

Please review the change.

-------------

Commit messages:
 - 6911: Third Party Upgrade to HdrHistogram 2.1.12

Changes: https://git.openjdk.java.net/jmc/pull/134/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=134&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-6911
  Stats: 5 lines in 5 files changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jmc/pull/134.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/134/head:pull/134

PR: https://git.openjdk.java.net/jmc/pull/134