[jdk11u-dev] RFR: 8287113: JFR: Periodic task thread uses period for method sampling events

[Amos Shi]

Backport of [JDK-8287113](https://bugs.openjdk.org/browse/JDK-8287113)
- `PlatformEventType.java` The line number changed are different from the original commit, well the contents are exactly the same, so this change can be considered as `clean`

Testing
- Local: `Passed` on MacOS M1 Laptop
  - `test/hotspot/jtreg/gc/stress/jfr` - Test results: passed: 10
- Pipeline: 
- Testing Machine:

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Commit messages:
 - Backport 8122466fbb8e3f3450131895551ec5b832845938

Changes: https://git.openjdk.org/jdk11u-dev/pull/2502/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2502&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8287113
  Stats: 5 lines in 2 files changed: 4 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2502.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2502/head:pull/2502

PR: https://git.openjdk.org/jdk11u-dev/pull/2502