Remove ResultsCursor::contains.

It's hardly worth it, and it needs to be removed so that
`GenKillAnalysis` can be removed.

compiler/rustc_mir_dataflow/src/framework/cursor.rs

@@ -7,7 +7,6 @@ use rustc_index::bit_set::BitSet;
 use rustc_middle::mir::{self, BasicBlock, Location};
 
 use super::{Analysis, Direction, Effect, EffectIndex, Results};
-use crate::framework::BitSetExt;
 
 /// Allows random access inspection of the results of a dataflow analysis.
 ///
@@ -221,16 +220,6 @@ where
     }
 }
 
-impl<'mir, 'tcx, A> ResultsCursor<'mir, 'tcx, A>
-where
-    A: crate::GenKillAnalysis<'tcx>,
-    A::Domain: BitSetExt<A::Idx>,
-{
-    pub fn contains(&self, elem: A::Idx) -> bool {
-        self.get().contains(elem)
-    }
-}
-
 #[derive(Clone, Copy, Debug)]
 struct CursorPosition {
     block: BasicBlock,

compiler/rustc_mir_dataflow/src/impls/storage_liveness.rs

@@ -364,7 +364,7 @@ where
     fn visit_local(&mut self, local: Local, context: PlaceContext, loc: Location) {
         if PlaceContext::NonMutatingUse(NonMutatingUseContext::Move) == context {
             self.borrowed_locals.seek_before_primary_effect(loc);
-            if !self.borrowed_locals.contains(local) {
+            if !self.borrowed_locals.get().contains(local) {
                 self.trans.kill(local);
             }
         }

compiler/rustc_mir_transform/src/elaborate_drops.rs

@@ -133,7 +133,7 @@ impl InitializationData<'_, '_> {
     }
 
     fn maybe_live_dead(&self, path: MovePathIndex) -> (bool, bool) {
-        (self.inits.contains(path), self.uninits.contains(path))
+        (self.inits.get().contains(path), self.uninits.get().contains(path))
     }
 }
 

compiler/rustc_mir_transform/src/ref_prop.rs

@@ -179,7 +179,7 @@ fn compute_replacement<'tcx>(
         } else {
             // This is a proper dereference. We can only allow it if `target` is live.
             maybe_dead.seek_after_primary_effect(loc);
-            let maybe_dead = maybe_dead.contains(target.local);
+            let maybe_dead = maybe_dead.get().contains(target.local);
             !maybe_dead
         }
     };