Add trivial set_bit_le in bitops.h

We're going to need to start setting bloom filters bits in mkfs so we'll
add this trivial inline.  It might grow later.

Signed-off-by: Zach Brown <zab@versity.com>

utils/src/bitops.h

@@ -0,0 +1,20 @@
+#ifndef _BITOPS_H_
+#define _BITOPS_H_
+
+#define BITS_PER_LONG (sizeof(long) * 8)
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define BITOP_LE_SWIZZLE        0
+#else
+#define BITOP_LE_SWIZZLE        ((BITS_PER_LONG-1) & ~0x7)
+#endif
+
+static inline void set_bit_le(int nr, void *addr)
+{
+	u64 *dwords = addr;
+
+	nr ^= BITOP_LE_SWIZZLE;
+
+	dwords[nr / 64] |= 1 << (nr & 63);
+}
+
+#endif