btrfs-progs: removed unused helpers from kernecompat.h

__set_bit and __clear_bit are unused and redundant, we have them in
kernel-lib/bitops.h as well.

Signed-off-by: David Sterba <dsterba@suse.com>

Author: kdave

include/kerncompat.h

@@ -313,31 +313,6 @@ static inline void up_read(struct rw_semaphore *sem)
 # define fallthrough			do {} while (0)  /* fallthrough */
 #endif
 
-/**
- * __set_bit - Set a bit in memory
- * @nr: the bit to set
- * @addr: the address to start counting from
- *
- * Unlike set_bit(), this function is non-atomic and may be reordered.
- * If it's called on the same region of memory simultaneously, the effect
- * may be that only one operation succeeds.
- */
-static inline void __set_bit(int nr, volatile unsigned long *addr)
-{
-	unsigned long mask = BITOP_MASK(nr);
-	unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
-
-	*p  |= mask;
-}
-
-static inline void __clear_bit(int nr, volatile unsigned long *addr)
-{
-	unsigned long mask = BITOP_MASK(nr);
-	unsigned long *p = ((unsigned long *)addr) + BITOP_WORD(nr);
-
-	*p &= ~mask;
-}
-
 /**
  * test_bit - Determine whether a bit is set
  * @nr: bit number to test