RFR 8222806: Inefficient String.replace in PathFileObject.toBinaryName

[Ron Shapiro]

Hi,

Please review this small change to improve the performance of
PathFileObject.toBinaryName:

webrev: http://cr.openjdk.java.net/~ronsh/8222806/webrev.00/
bug: https://bugs.openjdk.java.net/browse/JDK-8222806

Thanks!
Ron
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