RFR: 8324974: JFR: EventCompilerPhase should be created as UNTIMED

[Denghui Dong]

Hi,

Please help review this fix.

CompilerEvent::PhaseEvent::post will set the _start_time of EventCompilerPhase, so EventCompilerPhase should be created as UNTIMED.

Thanks.

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Commit messages:
 - 8324974: JFR: EventCompilerPhase should be created as UNTIMED

Changes: https://git.openjdk.org/jdk/pull/17632/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17632&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324974
  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/17632.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17632/head:pull/17632

PR: https://git.openjdk.org/jdk/pull/17632