ISA parser: Set up op_src_decl and op_dest_decl for pc operands.
ISA parser: Set up op_src_decl and op_dest_decl for pc operands.

andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin,andrewfu0325/gem5-aladdin