Fix comment.

Author: cjgillot

compiler/rustc_mir_dataflow/src/points.rs

@@ -32,8 +32,6 @@ impl DenseLocationMap {
                 v
             })
             .collect();
-        debug!("DenseLocationMap: statements_before_block={:#?}", statements_before_block);
-        debug!("DenseLocationMap: num_points={:#?}", num_points);
 
         let mut basic_blocks = IndexVec::with_capacity(num_points);
         for (bb, bb_data) in body.basic_blocks.iter_enumerated() {
@@ -57,7 +55,7 @@ impl DenseLocationMap {
         PointIndex::new(start_index + statement_index)
     }
 
-    /// Converts a `Location` into a `PointIndex`. O(1).
+    /// Returns the `PointIndex` for the first statement in the giben `BasicBlock`. O(1).
     #[inline]
     pub fn entry_point(&self, block: BasicBlock) -> PointIndex {
         let start_index = self.statements_before_block[block];
@@ -106,8 +104,7 @@ pub struct LivenessValues<N: Idx> {
 
 impl<N: Idx> LivenessValues<N> {
     /// Creates a new set of "region values" that tracks causal information.
-    /// Each of the regions in num_region_variables will be initialized with an
-    /// empty set of points and no causal information.
+    /// Each of the regions is initialized with an empty set of points.
     pub fn new(elements: Rc<DenseLocationMap>) -> Self {
         Self { points: SparseIntervalMatrix::new(elements.num_points), elements }
     }
@@ -120,30 +117,28 @@ impl<N: Idx> LivenessValues<N> {
     /// Adds the given element to the value for the given region. Returns whether
     /// the element is newly added (i.e., was not already present).
     pub fn add_element(&mut self, row: N, location: Location) -> bool {
-        debug!("LivenessValues::add(r={:?}, location={:?})", row, location);
         let index = self.elements.point_from_location(location);
         self.points.insert(row, index)
     }
 
     /// Adds all the elements in the given bit array into the given
     /// region. Returns whether any of them are newly added.
     pub fn add_elements(&mut self, row: N, locations: &IntervalSet<PointIndex>) -> bool {
-        debug!("LivenessValues::add_elements(row={:?}, locations={:?})", row, locations);
         self.points.union_row(row, locations)
     }
 
-    /// Adds all the control-flow points to the values for `r`.
+    /// Adds all the control-flow points to the values for `row`.
     pub fn add_all_points(&mut self, row: N) {
         self.points.insert_all_into_row(row);
     }
 
-    /// Returns `true` if the region `r` contains the given element.
+    /// Returns `true` if the region `row` contains the given element.
     pub fn contains(&self, row: N, location: Location) -> bool {
         let index = self.elements.point_from_location(location);
         self.points.row(row).is_some_and(|r| r.contains(index))
     }
 
-    /// Returns an iterator of all the elements contained by the region `r`
+    /// Returns an iterator of all the elements contained by the region `row`
     pub fn get_elements(&self, row: N) -> impl Iterator<Item = Location> + '_ {
         self.points
             .row(row)