RFR: JDK-8188312 Use CDS if present when running the Boot JDK during build

Magnus Ihse Bursie magnus.ihse.bursie at oracle.com
Tue Oct 3 10:24:43 UTC 2017

We should use CDS to minimize Java startup time during build. We run 
multiple Java commands, and every second counts.

On my machine, I get a ~3% build time speedup with this fix.

Bug: https://bugs.openjdk.java.net/browse/JDK-8188312


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