RFR: JDK-8301842: JFR: increase checkpoint event size for stacktrace and string pool

Mon Feb 6 10:03:32 UTC 2023

Could I have a review of a follow up fix to JDK-8298129.
JDK-8298129 increases checkpoint event size beyond u4 limit, but doesn't support it for stacktrace and string pools, that can exceed this limit.
Tested with jdk/jfr and tier1.

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Commit messages:
 - JDK-8301842: JFR: increase checkpoint event size for stacktrace and string pool

Changes: https://git.openjdk.org/jdk/pull/12432/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12432&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8301842
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/12432.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12432/head:pull/12432

PR: https://git.openjdk.org/jdk/pull/12432