Defines starting with `o' in vm

• OBJ_ACTIVE vm/vm_object.h:105
• OBJ_CANPERSIST vm/vm_object.h:103
• OBJ_INTERNAL vm/vm_object.h:104
• OMAP_ANON vm/vm_mmap.c:148
• OMAP_COPY vm/vm_mmap.c:149
• OMAP_FIXED vm/vm_mmap.c:151
• OMAP_INHERIT vm/vm_mmap.c:152
• OMAP_SHARED vm/vm_mmap.c:150