RFR: JDK-8144172: Problem with bootcycle-images and sjavac

[Erik Joelsson]

Hello,

The javac-server feature wasn't compatible with bootcycle-images. This 
fix is a bit of hack, but so was the original bootcycle implementation. 
We probably need to take a step back and figure out a better model for 
this later.

Bug: https://bugs.openjdk.java.net/browse/JDK-8144172
Webrev: http://cr.openjdk.java.net/~erikj/8144172/webrev.01/

/Erik