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

[Jaroslav Bachorik]

Mostly clean backport.
The only conflict was due to the 'largeSize' field in `PlatformEventType` class which is not available in JDK 11.
The conflict is resolved in a separate commit for easier review.

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Commit messages:
 - Fix merge conflict
 - 8287113: JFR: Periodic task thread uses period for method sampling events

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/1110/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=1110&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8287113
  Stats: 5 lines in 2 files changed: 4 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/1110.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/1110/head:pull/1110

PR: https://git.openjdk.java.net/jdk11u-dev/pull/1110