RFR: CODETOOLS-7903556: JMH: perfasm should capture Runtime blobs

[Aleksey Shipilev]

Currently perfasm resolves these blobs as `<unknown>`. We cannot easily parse them until [JDK-8316178](https://bugs.openjdk.org/browse/JDK-8316178) is fixed.

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Commit messages:
 - Touchups
 - Work

Changes: https://git.openjdk.org/jmh/pull/122/files
 Webrev: https://webrevs.openjdk.org/?repo=jmh&pr=122&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903556
  Stats: 298 lines in 6 files changed: 279 ins; 9 del; 10 mod
  Patch: https://git.openjdk.org/jmh/pull/122.diff
  Fetch: git fetch https://git.openjdk.org/jmh.git pull/122/head:pull/122

PR: https://git.openjdk.org/jmh/pull/122