* config/rs6000/xcoff.h (SKIP_ASM_OP): Define.
(ASM_OUTPUT_SKIP): Use it. SIZE unsigned.
(COMMON_ASM_OP): Define.
(ASM_OUTPUT_ALIGNED_COMMON): Use it. SIZE unsigned.
Use ALIGN parameter.
(LOCAL_COMMON_ASM_OP): Define.
(ASM_OUTPUT_LOCAL): Use it. SIZE unsigned.