RFR: JDK-8223346 - Update Graal

[jesper.wilhelmsson at oracle.com]

Hi,

Please review the patch to integrate recent Graal changes into OpenJDK.
Graal tip to integrate: 6a18d9ddacd8eecb0ae4877f687e171889939c0d

Bug: https://bugs.openjdk.java.net/browse/JDK-8223346
Webrev: http://cr.openjdk.java.net/~jwilhelm/8223346/webrev.00/

This integration did overwrite changes already in place in OpenJDK. The diff has been attached to the umbrella bug.

Thanks,
/Jesper

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