RFR: 8295350: JFR: Add stop methods for recording streams [v2]

[Erik Gahlin]

> Could I have a review of PR that adds stop() methods to RecordingStream and RemoteRecordingStream. Purpose is to provide better control of what is being recorded.
> 
> Testing: test/jdk/jdk/jfr
> 
> Thanks
> Erik

Erik Gahlin has updated the pull request incrementally with one additional commit since the last revision:

  Update comments

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/11337/files
  - new: https://git.openjdk.org/jdk/pull/11337/files/271f1b45..8baf0641

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11337&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11337&range=00-01

  Stats: 3 lines in 3 files changed: 1 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11337.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11337/head:pull/11337

PR: https://git.openjdk.org/jdk/pull/11337