RFR: JDK-8221341 - Update Graal

[jesper.wilhelmsson at oracle.com]

Hi,

Please review the patch to integrate the latest Graal changes into OpenJDK.
Graal tip to integrate: 7970bd76ff60600ab5a2fc96cd24ddd7ed017cf8

JBS duplicates fixed by this integration:
https://bugs.openjdk.java.net/browse/JDK-8220643
https://bugs.openjdk.java.net/browse/JDK-8220810

JBS duplicates deferred to the next integration:
https://bugs.openjdk.java.net/browse/JDK-8214947

Bug: https://bugs.openjdk.java.net/browse/JDK-8221341
Webrev: http://cr.openjdk.java.net/~jwilhelm/8221341/webrev.00/

Thanks,
/Jesper