RFR: Complete some todos in VMOptions

[Steafan Chou]

I'm sorry about the last commit, I forgot to update my branch.
I have updated the branch synchronously, please check the PR,thanks a lot.

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Commit messages:
 - Complete some todos in VMOptions

Changes: https://git.openjdk.org/jol/pull/28/files
 Webrev: https://webrevs.openjdk.org/?repo=jol&pr=28&range=00
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jol/pull/28.diff
  Fetch: git fetch https://git.openjdk.org/jol pull/28/head:pull/28

PR: https://git.openjdk.org/jol/pull/28