RFR(M): 8166560: [s390] Basic enablement of s390 port.

[Lindenmaier, Goetz]

Hi,

This change is part of the s390 port. It contains some basic adaptions needed for a full hotspot port for linux s390x. 

It defines the required macros, platform names and includes. 

The s390 port calles CodeCache::contains() in current_frame(), which is used in NMT. As NMT already collects stack traces before the CodeCache is initialized, contains() needs a check for this. 

 Wherever a row of platforms are listed, I sorted them alphabetically. 

 The jdk requires the file jvm.cfg.

Please review. I please need a sponsor.
http://cr.openjdk.java.net/~goetz/wr16/8166560-basic_s390/hotspot.wr01/
http://cr.openjdk.java.net/~goetz/wr16/8166560-basic_s390/jdk.wr01/

Best regards,
  Goetz.