Review request 8145409: Better detect JRE that JLI will be using

[Dmitry Cherepanov]

Hello,

Please review the following patch

https://bugs.openjdk.java.net/browse/JDK-8145409
http://cr.openjdk.java.net/~dcherepanov/8145409/webrev.v0/

The patch improves GetJREPath() on Windows and implements a fallback for 
applications with custom native launcher and private JRE.

Thanks,

Dmitry