RFR: 8168093: Need a way for the launcher to query the JRE location using Windows registry.

[Kumar Srinivasan]

Hello,

I am sponsoring this patch for the client team, the issue here
is that the Windows installer copies the java launcher binaries to a
system folder, and those binaries need to locate the Java Runtime
using Windows registry. These changes are to allow calling an
internal (Registry locator) method for the product build.

http://cr.openjdk.java.net/~ksrini/8168093/webrev.00/

Thanks
Kumar