[jdk11u-dev] RFR: 8289745: JfrStructCopyFailed uses heap words instead of bytes for object sizes

[Ralf Schmelter]

Hi,
 
This is a backport of JDK-8289745: JfrStructCopyFailed uses heap words instead of bytes for object sizes
 
Original patch does not apply cleanly to 11u, because the adaption to the G1 event is not
needed, since it is present in JDK 11.

Tested tier1-4 for all platforms without any issues.
 
Thanks,
-Ralf

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Commit messages:
 - Downported change (apart from g1 code, which is not present in 11)

Changes: https://git.openjdk.org/jdk11u-dev/pull/2237/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2237&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8289745
  Stats: 11 lines in 3 files changed: 8 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2237.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2237/head:pull/2237

PR: https://git.openjdk.org/jdk11u-dev/pull/2237