RFR: 8284458: CodeHeapState::aggregate() leaks blob_name

[Zhengyu Gu]

Please review this small patch to fix a possible memory leak.

Test:
- [x] hotspot_serviceability

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Commit messages:
 - Merge branch 'master' into JDK-8284458-memleak-CodeHeapState
 - fix
 - 8284458: CodeHeapState::aggregate() leaks blob_name

Changes: https://git.openjdk.java.net/jdk/pull/8132/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8132&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8284458
  Stats: 9 lines in 1 file changed: 4 ins; 3 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8132.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8132/head:pull/8132

PR: https://git.openjdk.java.net/jdk/pull/8132