Adjust CG for RetroBSD's assembler
Adjust CG for RetroBSD's assembler

Finally, make the code generator fully compatible with RetroBSD's as in
the default, non-gp-relative mode. Use the ar register, the lui
instruction and the %hi() and %lo() macros.

gdos/SmallerC,JianpingZeng/SmallerC,JianpingZeng/SmallerC,gdos/SmallerC