* system.h: Poison ASM_BYTE_OP and ASM_OUTPUT_BYTE.
	* vmsdbgout: Do not undefine it if defined.
	Rename local ASM_BYTE_OP definition to VMS_ASM_BYTE_OP.
	* config/microblaze/microblaze/h: Do no define ASM_BYTE_OP.
	* config/mep/mep.h: Do not define ASM_OUTPUT_BYTE.

From-SVN: r188917