Merged and pushed.
- bug#16544: Optimazation for is_mb_middle Norihiro Tanaka
- bug#16544: Optimazation for is_mb_middle Jim Meyering
- bug#16544: Optimazation for is_mb_middle Norihiro Tanaka
- bug#16544: Optimazation for is_mb_middle Paul Eggert
- bug#16544: Optimazation for is_mb_middle Norihiro Tanaka
- bug#16544: Optimazation for is_mb_mi... Jim Meyering
- bug#16544: Optimazation for is_m... Norihiro Tanaka
- bug#16544: Optimazation for ... Jim Meyering
- bug#16544: Optimazation for ... Jim Meyering
- bug#16544: Optimazation for ... Norihiro Tanaka
