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:153
• OMAP_COPY vm/vm_mmap.c:154
• OMAP_FIXED vm/vm_mmap.c:156
• OMAP_INHERIT vm/vm_mmap.c:157
• OMAP_SHARED vm/vm_mmap.c:155