RFR: CODETOOLS-7903075: JOL: Incorrect ClassLayout header/loss calculation for arrays

[Aleksey Shipilev]

See the bug report.

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Commit messages:
 - Fix

Changes: https://git.openjdk.java.net/jol/pull/20/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jol&pr=20&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7903075
  Stats: 4 lines in 1 file changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jol/pull/20.diff
  Fetch: git fetch https://git.openjdk.java.net/jol pull/20/head:pull/20

PR: https://git.openjdk.java.net/jol/pull/20