RFR 8142535: Compiler throws NPE when classpath includes "/"

[ShinyaYoshida]

Hi,
I found that javac throws NPE when the class path is "/" and have the fix
and the test for this issue.

Could you consider and review my patch?

Webrev: http://cr.openjdk.java.net/~shinyafox/8142535/webrev.00/
Bugs: https://bugs.openjdk.java.net/browse/JDK-8142535

Regards,
shinyafox(Shinya Yoshida)
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