The below instructions were fixed so that the produced condition
codes in simulator matched behaviour in native s390 CPUs:

CFDBR
CGDBR
CGEBR
CFEBR
CLFDBR
CLGDBR
CLGEBR

Also implemented the CLFEBR instruction in s390 simulator.

(Copypaste of 1763663003, which was pointing at wrong branch - should be master, not lkgr)

R=danno@chromium.org,jkummerow@chromium.org,jochen@chromium.org,joransiu@ca.ibm.com,michael_dawson@ca.ibm.com,mbrandy@us.ibm.com,jyan@ca.ibm.com

BUG=

Review URL: https://codereview.chromium.org/1773813002

Cr-Commit-Position: refs/heads/master@{#34598}