RFR: 8327645: Serial heap dump should not consume double amount of disk space

[Man Cao]

Hi all,

Could anyone review this fix to make serial heap dump only write to a single file?
We highly appreciate the work in https://bugs.openjdk.org/browse/JDK-8306441. However, many of our customers still need to use serial heap dump, as they have limited disk space and need to dump to a network socket.

-Man

-------------

Commit messages:
 - 8327645: Serial heap dump should not consume double amount of disk space

Changes: https://git.openjdk.org/jdk/pull/18160/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18160&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327645
  Stats: 64 lines in 1 file changed: 28 ins; 12 del; 24 mod
  Patch: https://git.openjdk.org/jdk/pull/18160.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18160/head:pull/18160

PR: https://git.openjdk.org/jdk/pull/18160