[8u20] Request for approval to backport JDK-8031475: Missing oopmap in patching stubs

[Nils Eliasson]

Please approve the backport of JDK-8031745 from 9 to 8u20.

8031475: http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/6448
         http://cr.openjdk.java.net/~neliasso/8031475/webrev.06/
         
Applies cleanly to http://hg.openjdk.java.net/jdk8u/hs-dev/

Kind Regards,
Nils Eliasson