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bhndb(4): Drop MIPS-incompatible __builtin_ctz dependency.

Description

bhndb(4): Drop MIPS-incompatible __builtin_ctz dependency.

This replaces the bitfield representation of the bhndb register window
freelist with the bitstring API, eliminating a dependency on
(MIPS-unsupported) __builtin_ctz().

Approved by: adrian (mentor)
Differential Revision: https://reviews.freebsd.org/D7495