Defines starting with `b' in osfmk/ddb

• BACKUP osfmk/ddb/db_input.c:231
• BKPT_1ST_SET osfmk/ddb/db_break.h:179
• BKPT_SET_IN_MEM osfmk/ddb/db_break.h:178
• BKPT_SINGLE_STEP osfmk/ddb/db_break.h:175
• BKPT_TEMP osfmk/ddb/db_break.h:176
• BKPT_USR_GLOBAL osfmk/ddb/db_break.h:177
• BLANK osfmk/ddb/db_input.c:230