RFR: 8220633: Optimize CacheFSInfo

[Liam Miller-Cushon]

On Wed, Mar 13, 2019 at 5:59 PM Jonathan Gibbons <
jonathan.gibbons at oracle.com> wrote:

> I could go either way on getJarClassPath.  The initial version in
> webrev.00 was definitely shorter.
>
computeIfAbsent feels a little more idiomatic to me than the intentional
race (and the comment to explain why it's safe), but I don't really have a
preference.

I'm happy to revert to webrev.00 if you prefer.
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