Remove now unused GenKill impl for old GenKillSet

Author: ecstatic-morse

src/librustc_mir/dataflow/generic/mod.rs

@@ -451,16 +451,5 @@ impl<T: Idx> GenKill<T> for BitSet<T> {
     }
 }
 
-// For compatibility with old framework
-impl<T: Idx> GenKill<T> for crate::dataflow::GenKillSet<T> {
-    fn gen(&mut self, elem: T) {
-        self.gen(elem);
-    }
-
-    fn kill(&mut self, elem: T) {
-        self.kill(elem);
-    }
-}
-
 #[cfg(test)]
 mod tests;