RFR: CODETOOLS-7903522: JOL: Heap dump readers should print progress [v3]

[Aleksey Shipilev]

> For large heap dumps, it would be convenient to see the read progress.

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  Also add flushes

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Changes:
  - all: https://git.openjdk.org/jol/pull/46/files
  - new: https://git.openjdk.org/jol/pull/46/files/2a81bb5c..ddad69bb

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jol&pr=46&range=02
 - incr: https://webrevs.openjdk.org/?repo=jol&pr=46&range=01-02

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jol/pull/46.diff
  Fetch: git fetch https://git.openjdk.org/jol.git pull/46/head:pull/46

PR: https://git.openjdk.org/jol/pull/46