RFR: JDK-8299672: Enhance HeapDump JFR event [v2]

[Matthias Baesken]

> Enhance the JFR Event HeapDump  with the additional interesting fields, compression and overwrite.
> Add some UL logging in case the heap dump writing failed .

Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:

  Adjust compression check to below in TestHeapDump.java

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11864/files
  - new: https://git.openjdk.org/jdk/pull/11864/files/750ccf90..8543c307

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11864&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11864&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11864.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11864/head:pull/11864

PR: https://git.openjdk.org/jdk/pull/11864