[jdk8u-dev] RFR: 8287113: JFR: Periodic task thread uses period for method sampling events

[Alexey Bakhtin]

Clean backport from JDK11
I'd like to backport it to improve resource usage when running an application with the JFR default profile.

All JFR-related JTREG tests passed

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Commit messages:
 - Backport 8122466fbb8e3f3450131895551ec5b832845938

Changes: https://git.openjdk.org/jdk8u-dev/pull/601/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=601&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/jdk8u-dev/pull/601.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev.git pull/601/head:pull/601

PR: https://git.openjdk.org/jdk8u-dev/pull/601