RFR: 8255694: memory leak in JDWP debug agent after calling JVMTI GetAllThreads [v2]

[Chris Plummer]

> The debug agent needs to deallocate memory that is allocated by calls to GetAllThreads. There were two places were this was not being done, resulting in a memory leak.

Chris Plummer has updated the pull request incrementally with one additional commit since the last revision:

  Remove unecessary semicolon

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/968/files
  - new: https://git.openjdk.java.net/jdk/pull/968/files/06063b7d..4e4dcae6

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=968&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=968&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/968.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/968/head:pull/968

PR: https://git.openjdk.java.net/jdk/pull/968