RFR: 8212155: Race condition when posting dynamic_code_generated event leads to JVM crash [v3]

[Leonid Mesnik]

> Fixed a race condition between posting and enabling DynamicCodeGenerated event.

Leonid Mesnik has updated the pull request incrementally with one additional commit since the last revision:

  updated test.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4331/files
  - new: https://git.openjdk.java.net/jdk/pull/4331/files/c650f446..7482d580

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4331&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4331&range=01-02

  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4331.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4331/head:pull/4331

PR: https://git.openjdk.java.net/jdk/pull/4331