Macros starting with 'b' in sys

• B_CONTROLLER sys/reboot.h:71
• binshash sys/buf.h:186
• binsheadfree sys/buf.h:200
• binstailfree sys/buf.h:206
• B_PARTITION sys/reboot.h:77
• bremfree sys/buf.h:196
• bremhash sys/buf.h:182
• btokmemx sys/malloc.h:226
• btokup sys/malloc.h:227
• B_TYPE sys/reboot.h:80
• BUCKETINDX sys/malloc.h:189
• BUFHASH sys/buf.h:116
• B_UNIT sys/reboot.h:74