RFR: JDK-8297911: Memory leak in JfrUpcalls::on_retransform

[Justin King]

JDK-8297911: Memory leak in JfrUpcalls::on_retransform

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Commit messages:
 - Memory leak in JfrUpcalls::on_retransform

Changes: https://git.openjdk.org/jdk/pull/11445/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11445&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297911
  Stats: 19 lines in 2 files changed: 0 ins; 5 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/11445.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11445/head:pull/11445

PR: https://git.openjdk.org/jdk/pull/11445