Assertions for issue #302 (e40s)
Created by: silabs-oysteink
Added assertions to check that no CSR flop outputs change if a set or clear operation is being performed when rs1==0.
Updated assertion that checks branch target stability to factor in 'last_op' when terminating the check, and removed dependency on kill_ex in the left hand side.
Signed-off-by: Oystein Knauserud Oystein.Knauserud@silabs.com