RFR 8220792: JavacFileManager.list() performance

[Ron Shapiro]

Hi,

Please review this change to improve the performance of
JavacFileManager.list().

bug: https://bugs.openjdk.java.net/browse/JDK-8220792
webrev: http://cr.openjdk.java.net/~ronsh/8220792/webrev.00/

Thanks,
Ron
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