RFR: 8243208: Clean up JVMFlag implementation [v4]

[Coleen Phillimore]

On Wed, 9 Sep 2020 20:47:32 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> The initial commit [d85cbd6](https://github.com/openjdk/jdk/commit/d85cbd638f5b87c80eee9a92d10e1ac19d9bb2f8) is the
>> same patch as
>> [8243208-cleanup-jvmflag-impl.v02](https://cr.openjdk.java.net/~iklam/jdk16/8243208-cleanup-jvmflag-impl.v02/)
>> published in
>> [hotspot-dev at openjdk.java.net](https://mail.openjdk.java.net/pipermail/hotspot-dev/2020-September/042863.html).  The
>> rest of the review will continue on GitHub. I will add new commits to respond to comments to the above e-mail.
>
> Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Refactored JVMFlagLookup::hash_code(); Cleaned up LimitGetter::no_limit()

Marked as reviewed by coleenp (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/82