RFR: 8362530: VM crash with -XX:+PrintTieredEvents when collecting AOT profiling

[Igor Veresov]

When printing tiered events we take the ttyLock and also now the trainingDataLock. While benign it's best to decouple these. The solution is to gather the output bits in a buffer and then print it.

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Commit messages:
 - Decouple gathering the output bits from printing

Changes: https://git.openjdk.org/jdk/pull/26750/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26750&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8362530
  Stats: 68 lines in 2 files changed: 11 ins; 2 del; 55 mod
  Patch: https://git.openjdk.org/jdk/pull/26750.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26750/head:pull/26750

PR: https://git.openjdk.org/jdk/pull/26750