[jdk18u] RFR: 8284458: CodeHeapState::aggregate() leaks blob_name

[Zhengyu Gu]

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

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Commit messages:
 - Backport d4a48843856e3d80a58d5a0a26dff6c4d349dca9

Changes: https://git.openjdk.java.net/jdk18u/pull/110/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk18u&pr=110&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8284458
  Stats: 10 lines in 1 file changed: 4 ins; 3 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk18u/pull/110.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk18u pull/110/head:pull/110

PR: https://git.openjdk.java.net/jdk18u/pull/110