[8u60] (XS) RFR: 8071972: Minimal VM is broken

[David Holmes]

http://cr.openjdk.java.net/~dholmes/8071972/webrev.8u60/

Original bug is confidential but the backport issue is not:

https://bugs.openjdk.java.net/browse/JDK-8072057

Simple fix to ensure header inclusion is guarded based on all GCs being 
included.

This fix is not applicable to 9 due to the changes there that have 
removed the parNew and defNew support. In fact inclusion of this header 
is no longer needed in 9 and I've filed

https://bugs.openjdk.java.net/browse/JDK-8072056

to clean that up.

Thanks,
David