[RFR]: [S390] Fix JFR profiling

[Haug, Gunter]

Hi all,

can I please have reviews and a sponsor for the following tiny fix which only affects one s390 platform file:

https://bugs.openjdk.java.net/browse/JDK-8221479
http://cr.openjdk.java.net/~ghaug/webrevs/8221479/

It detects addresses which are totally off and would have been dereferenced otherwise. This caused very rare crashes on s390.


Thanks,
Gunter