RFR: 8220633: Optimize CacheFSInfo

[Liam Miller-Cushon]

Hi,

Please consider the following optimization to CacheFSInfo, which makes the
caching finer-grained and reduces the number of filesystem calls.

bug: https://bugs.openjdk.java.net/browse/JDK-8220633
webrev: http://cr.openjdk.java.net/~cushon/8220633/webrev.00/
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