RFR: 8257602: Introduce JFR Event Throttling and new jdk.ObjectAllocationSample event (enabled by default) [v2]

[Markus Grönlund]

> Greetings,
> 
> please help review this enhancement to let JFR sample object allocations by default.
> 
> A description is provided in the JIRA issue.
> 
> Thanks
> Markus

Markus Grönlund has updated the pull request incrementally with one additional commit since the last revision:

  General ObjectAllocationSample event definition

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1624/files
  - new: https://git.openjdk.java.net/jdk/pull/1624/files/dba878aa..196d254d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1624&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1624&range=00-01

  Stats: 23 lines in 2 files changed: 0 ins; 18 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1624.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1624/head:pull/1624

PR: https://git.openjdk.java.net/jdk/pull/1624