PERF: Exploit AndP to use RISBG for consecutive bits and ClearRightImm
Exploit more CompareLogical
Disable use of distinct operations in simulator temporarily
Add better fix to CFDBR overflow check
Fix AHIK simulation and re-enable distinct operands.
Fix top bit problem and fix loading sp from wrong offset in RegExpMacroAssemblerS390::CallCFunctionUsingStub