[RFR]: [S390] Implement JFR profiling

[Haug, Gunter]

Hi all,

can I please have reviews and a sponsor fort the following change:

https://bugs.openjdk.java.net/browse/JDK-8211768
http://cr.openjdk.java.net/~ghaug/webrevs/8211768/

The implementation is basically the same as for PPC. It was only adapted for the different use of registers and the slightly different frame layout of s390. The respective tests don't fail anymore on s390 with this patch.

Thanks,
Gunter