RFR: CODETOOLS-7902868: JOL: Rework JOL Samples for modern JDKs

[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.

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Commit messages:
 - Fix builds
 - Add missing files
 - Revert again
 - Revert after merge
 - Merge branch 'master' into samples-overhaul
 - Overhaul JOL Samples

Changes: https://git.openjdk.java.net/jol/pull/13/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jol&pr=13&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902868
  Stats: 751 lines in 32 files changed: 399 ins; 309 del; 43 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