RFR: 8216403: Allocate fewer EnumSets in JavacFileManager#list

[Liam Miller-Cushon]

Hi,

Please consider this trivial performance improvement, which moves a couple
of allocations out of JavacFileManager#list.

bug: https://bugs.openjdk.java.net/browse/JDK-8216403
webrev: http://cr.openjdk.java.net/~cushon/8216403/webrev.00/

Thanks,
Liam
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