regex/literals: re-enable Tuned Boyer-Moore
regex/literals: re-enable Tuned Boyer-Moore

We've added tests and carefully scrutinized it. Let's try this again.

rust-lang/regex,rust-lang-nursery/regex,rust-lang-nursery/regex,rust-lang-nursery/regex,rust-lang/regex,rust-lang/regex,rust-lang-nursery/regex,rust-lang/regex,rust-lang/regex,rust-lang-nursery/regex