Add Simulator support for AHIK/AGHIK
Add RRR arithmetic and bitwise ops to simulator
Add SL*K + S*AK instructions to simulator.  Fix bug in AHIK/AGHIK simulation
Exploit CmpLogicalP in stub-cache-s390
Fix cfdbr round to zero overflow bug, set condition code
Merge branch 'master' of github.com:andrewlow/v8z
Fix simulator issue -- not whacking RA
Fix trap4 in 64 bit simulation