for built-in functions and type conversions. Extract out common operations on expression nodes for converting them to ints and implicitly dereferencing arrays. R=rsc APPROVED=rsc DELTA=442 (365 added, 50 deleted, 27 changed) OCL=34064 CL=34064
checking, bounds checking, and map key checking. R=rsc APPROVED=rsc DELTA=202 (108 added, 72 deleted, 22 changed) OCL=33981 CL=34031