RFR: CODETOOLS-7902866: JOL: Rework the instance dump output: formatting, decoding mark/class words, array length

[Aleksey Shipilev]

JOL already knows a lot about the target VM. It can also decode the object headers more verbosely.

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Commit messages:
 - CODETOOLS-7902866: JOL: Rework the instance dump output: formatting, decoding mark/class words, array length
 - Decode mark word

Changes: https://git.openjdk.java.net/jol/pull/11/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jol&pr=11&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902866
  Stats: 231 lines in 7 files changed: 155 ins; 23 del; 53 mod
  Patch: https://git.openjdk.java.net/jol/pull/11.diff
  Fetch: git fetch https://git.openjdk.java.net/jol pull/11/head:pull/11

PR: https://git.openjdk.java.net/jol/pull/11