RFR: 7903410: JOL: Extend "estimate" to heap dumps and Lilliput

[Aleksey Shipilev]

For Lilliput, we want an easy way to estimate the potential footprint improvements. "estimate" should be extended with Lilliput models, and "heapdump-estimate" should be added to read the data from heap dumps.

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Commit messages:
 - Heap estimates

Changes: https://git.openjdk.org/jol/pull/38/files
 Webrev: https://webrevs.openjdk.org/?repo=jol&pr=38&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903410
  Stats: 307 lines in 6 files changed: 288 ins; 12 del; 7 mod
  Patch: https://git.openjdk.org/jol/pull/38.diff
  Fetch: git fetch https://git.openjdk.org/jol pull/38/head:pull/38

PR: https://git.openjdk.org/jol/pull/38