RFR: 8218767: ZGC: Do not assume that r12 is a special register in C2

Per Liden per.liden at oracle.com
Tue Feb 19 13:40:30 UTC 2019

The C2 load barrier code for ZGC assumes that r12 is not used as a 
general purpose register. However, JDK-8217909 might change that, so ZGC 
should not be making this assumption.

Bug: https://bugs.openjdk.java.net/browse/JDK-8218767
Webrev: http://cr.openjdk.java.net/~pliden/8218767/webrev.0


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