RFR: 8259627: Potential memory leaks in JVMTI after JDK-8227745

[Richard Reingruber]

This change eliminates memory leaks in the JVMTI implementation reported by SonarCloud.

The leaks occur when the Java heap is exhausted.

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

Commit messages:
 - 8259627: Potential memory leaks in JVMTI after JDK-8227745

Changes: https://git.openjdk.java.net/jdk/pull/2055/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2055&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259627
  Stats: 16 lines in 1 file changed: 8 ins; 8 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2055.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2055/head:pull/2055

PR: https://git.openjdk.java.net/jdk/pull/2055