Konstantin Belousov 1550c62236 Add BIT_FLS() analogous to BIT_FFS().
The benefit of BIT_FLS() is that ffsl() can be implemented with a
count leading zeros instruction which is more widespread available.

Submitted by:	Sebastian Huber <sebastian.huber@embedded-brains.de>
MFC after:	1 week
2017-07-06 21:47:17 +00:00
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