RFR: 8220633: Optimize CacheFSInfo

[Liam Miller-Cushon]

On Wed, Mar 13, 2019 at 5:12 PM Jonathan Gibbons <
jonathan.gibbons at oracle.com> wrote:

> Please don't reformat the scary comment ;-)  You'll frighten away any
> scripts
> that might check for the comment.
>
Thanks--the reformatting of unchanged lines was accidental, I reverted
those parts.

> Is there a reason you don't use computeIfAbsent in getJarClassPath?
>
I switched to use computeIfAbsent there too.

It does requires wrapping/unwrapping the IOException, but I think it's
probably still a better choice. Mostly I was focused on the other other
methods.

Here's the updated webrev:
http://cr.openjdk.java.net/~cushon/8220633/webrev.01/
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