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

Per Liden per.liden at oracle.com
Wed Feb 20 11:00:52 UTC 2019

Updated version rebased on top of JDK-8217909 (which Roman will push 



On 2/19/19 2:40 PM, Per Liden wrote:
> 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
> /Per

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