[jdk18u] RFR: 8284532: Memory leak in BitSet::BitMapFragmentTable in JFR leak profiler

[Zhengyu Gu]

A clean and low risk backport to fix a memory leak.

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Commit messages:
 - Backport b55c32f5fe452e2b4e6f912a7d27f979e68ba67e

Changes: https://git.openjdk.java.net/jdk18u/pull/111/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk18u&pr=111&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8284532
  Stats: 14 lines in 2 files changed: 12 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk18u/pull/111.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk18u pull/111/head:pull/111

PR: https://git.openjdk.java.net/jdk18u/pull/111