RFR: 8208582: Introduce native oop barriers in C1 for OopHandle

[Erik Österlund]

Hi,

There is currently no way of doing IN_NATIVE accesses in C1 using its access API. These are required to properly access OopHandle, used to access the Java class mirrors (because they will now start requiring load barriers). In order to support concurrent class unloading in ZGC, this support must be added.
This webrev adds C1 support for this:
http://cr.openjdk.java.net/~eosterlund/8208582/webrev.00/ (https://link.getmailspring.com/link/1533049674.local-48cfadc1-4a64-v1.3.0-fd741eb7@getmailspring.com/0?redirect=http%3A%2F%2Fcr.openjdk.java.net%2F~eosterlund%2F8208582%2Fwebrev.00%2F&recipient=aG90c3BvdC1jb21waWxlci1kZXZAb3Blbmpkay5qYXZhLm5ldA%3D%3D)

Bug URL:
https://bugs.openjdk.java.net/browse/JDK-8208582 (https://link.getmailspring.com/link/1533049674.local-48cfadc1-4a64-v1.3.0-fd741eb7@getmailspring.com/1?redirect=https%3A%2F%2Fbugs.openjdk.java.net%2Fbrowse%2FJDK-8208582&recipient=aG90c3BvdC1jb21waWxlci1kZXZAb3Blbmpkay5qYXZhLm5ldA%3D%3D)

Thanks,
/Erik
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