RFR(M): 8236555: [s390] Fix VerifyOops

[Doerr, Martin]

Hi,

parts of the implementation for VerifyOops for s390 are missing.
I'd like to make the develop feature -XX:+VerifyOops usable.

Webrev:
http://cr.openjdk.java.net/~mdoerr/8236555_s390_VerifyOops/webrev.00/

Please review.

Best regards,
Martin