RFR: JDK-8319053: Segment dump files remain after parallel heap dump on Windows [v2]

[Alex Menkov]

> Segment file is closed from DumpWriter dtor.
> On Unix systems `remove` can delete an opened file, on Windows it fails with "access denied".
> The fix destroys DumpWriter objects for segment files after all data are dumped

Alex Menkov has updated the pull request incrementally with one additional commit since the last revision:

  updated log text

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16462/files
  - new: https://git.openjdk.org/jdk/pull/16462/files/8a1f0eb0..6474afaf

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16462&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16462&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/16462.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16462/head:pull/16462

PR: https://git.openjdk.org/jdk/pull/16462