PR: Update the field access methods in ZipUtils to use the VarHandle API

[Eirik Bjørsnøs]

>
> Please review the following PR which suggests updating the field access
> methods in ZipUtils to use the VarHandle API
> https://github.com/openjdk/jdk/pull/12273
>

Never mind, Claes pointed out that VarHandles may take some time to warp up
and we did indeed measure a regression for cold-start opening of ZipFiles.

I've closed this PR.

Thanks,
Eirik.

>
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