RFR: JDK-8319437: NMT should show library names in call stacks

[Thomas Stuefe]

With this tiny enhancement, NMT shows library names in callstacks.

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Commit messages:
 - start

Changes: https://git.openjdk.org/jdk/pull/16508/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16508&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319437
  Stats: 21 lines in 1 file changed: 15 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/16508.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16508/head:pull/16508

PR: https://git.openjdk.org/jdk/pull/16508