perfs: W-LSB: unroll g() function in wlsb_get_minkp_32bits()
perfs: W-LSB: unroll g() function in wlsb_get_minkp_32bits()

didier-barvaux/rohc,didier-barvaux/rohc,didier-barvaux/rohc,didier-barvaux/rohc,didier-barvaux/rohc