RFR [XS] : 8219112: name_and_sig_as_C_string usages in frame_s390 miss ResourceMark

[Baesken, Matthias]

Hello,  please review  this small fix.
It adds missing  2 times a   missing   ResouceMark  in s390x specific coding
 (there are 2 name_and_sig_as_C_string() calls in frame_s390.cpp that miss a ResourceMark ).


Bug/webrev :

http://cr.openjdk.java.net/~mbaesken/webrevs/8219112.0/

https://bugs.openjdk.java.net/browse/JDK-8219112


Thanks ,   Matthias