In this PR I introduce two new JFR events: - `jdk.StringDeduplicationStatistics` - `jdk.StringDeduplicationTimes`

The events are emitted every time a deduplication cycle happens, and they contain information about that cycle only.

Passes tier1 and tier2 (fastdebug).

Francesco Andreuzzi has updated the pull request incrementally with two additional commits since the last revision: - disable - revert ------------- Changes: - all: https://git.openjdk.org/jdk/pull/28015/files - new: https://git.openjdk.org/jdk/pull/28015/files/bff0fd30..c3c9a8db Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=28015&range=02 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28015&range=01-02 Stats: 3 lines in 2 files changed: 0 ins; 2 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/28015.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/28015/head:pull/28015 PR: https://git.openjdk.org/jdk/pull/28015