RFR: CODETOOLS-7902868: JOL: Rework JOL Samples for modern JDKs [v2]

[Aleksey Shipilev]

> Current JOL samples were written in the era of JDK 8. Since then, quite a few improvements landed in JVMs, and we need to update the samples to reflect those.

Aleksey Shipilev has updated the pull request incrementally with two additional commits since the last revision:

 - Reshuffle test order
 - Contended without explicit imports

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Changes:
  - all: https://git.openjdk.java.net/jol/pull/13/files
  - new: https://git.openjdk.java.net/jol/pull/13/files/7fe001b8..b811c002

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jol&pr=13&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jol&pr=13&range=00-01

  Stats: 77 lines in 14 files changed: 60 ins; 1 del; 16 mod
  Patch: https://git.openjdk.java.net/jol/pull/13.diff
  Fetch: git fetch https://git.openjdk.java.net/jol pull/13/head:pull/13

PR: https://git.openjdk.java.net/jol/pull/13