RFR: 8307488: Incorrect weight of the first ObjectAllocationSample JFR event

[Markus Grönlund]

Greetings,

this PR fixes the problem with incorrect weights attribution for the initial ObjectAllocationSample event.

Testing: jdk_jfr

Thanks
Markus

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Commit messages:
 - 8307488

Changes: https://git.openjdk.org/jdk/pull/14158/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14158&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307488
  Stats: 81 lines in 4 files changed: 44 ins; 24 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/14158.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14158/head:pull/14158

PR: https://git.openjdk.org/jdk/pull/14158