RFR: some code clean.

[Steafan Chou]

Hi friends,I am studying the JOL source,i cleaned some code,thanks.

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Commit messages:
 - some code clean.

Changes: https://git.openjdk.org/jol/pull/26/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jol&pr=26&range=00
  Stats: 257 lines in 21 files changed: 151 ins; 0 del; 106 mod
  Patch: https://git.openjdk.org/jol/pull/26.diff
  Fetch: git fetch https://git.openjdk.org/jol pull/26/head:pull/26

PR: https://git.openjdk.org/jol/pull/26