RFR: CODETOOLS-7903569: JOL: Use human-readable class names consistently

[Aleksey Shipilev]

There are a couple of places, where we print out JVM names for classes. Notably, it happens during "footprint". We need to consistently use the human-readable class names everywhere.

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Commit messages:
 - Fix

Changes: https://git.openjdk.org/jol/pull/51/files
 Webrev: https://webrevs.openjdk.org/?repo=jol&pr=51&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903569
  Stats: 14 lines in 4 files changed: 1 ins; 2 del; 11 mod
  Patch: https://git.openjdk.org/jol/pull/51.diff
  Fetch: git fetch https://git.openjdk.org/jol.git pull/51/head:pull/51

PR: https://git.openjdk.org/jol/pull/51