Fix simulator bug in DR: Cast r1+1 value to unsigned int to avoid getting sign-extended value
Fix simulator bug in SRDA: change cast from int to uint to prevent incorrect construction of 64bit operand from reg-reg pair
Exploit shorter branches in DoModI/DoDivI
Fix up cond branch helpers to allow Label::Distance qualifier
Add AGFR to simulator
Fix RecordWriteStub -- initial mode (STORE_BUFFER_ONLY) broken