RFR: 8362530: VM crash with -XX:+PrintTieredEvents when collecting AOT profiling [v3]

[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.

Igor Veresov has updated the pull request incrementally with one additional commit since the last revision:

  Address Christian's comments

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26750/files
  - new: https://git.openjdk.org/jdk/pull/26750/files/0aeea89e..2c8957cd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26750&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26750&range=01-02

  Stats: 11 lines in 2 files changed: 10 ins; 1 del; 0 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