[perf] test MCP510

compiler/rustc_borrowck/src/lib.rs

@@ -29,7 +29,7 @@ use rustc_errors::LintDiagnostic;
 use rustc_hir as hir;
 use rustc_hir::CRATE_HIR_ID;
 use rustc_hir::def_id::LocalDefId;
-use rustc_index::bit_set::MixedBitSet;
+use rustc_index::bit_set::{DenseBitSet, MixedBitSet};
 use rustc_index::{IndexSlice, IndexVec};
 use rustc_infer::infer::{
     InferCtxt, NllRegionVariableOrigin, RegionVariableOrigin, TyCtxtInferExt,
@@ -1966,7 +1966,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, '_, 'tcx> {
         location: Location,
         desired_action: InitializationRequiringAction,
         place_span: (PlaceRef<'tcx>, Span),
-        maybe_uninits: &MixedBitSet<MovePathIndex>,
+        maybe_uninits: &DenseBitSet<MovePathIndex>,
         from: u64,
         to: u64,
     ) {

compiler/rustc_mir_dataflow/src/impls/initialized.rs

@@ -484,7 +484,7 @@ impl<'tcx> Analysis<'tcx> for MaybeInitializedPlaces<'_, 'tcx> {
 
 /// There can be many more `MovePathIndex` than there are locals in a MIR body.
 /// We use a mixed bitset to avoid paying too high a memory footprint.
-pub type MaybeUninitializedPlacesDomain = MixedBitSet<MovePathIndex>;
+pub type MaybeUninitializedPlacesDomain = DenseBitSet<MovePathIndex>;
 
 impl<'tcx> Analysis<'tcx> for MaybeUninitializedPlaces<'_, 'tcx> {
     type Domain = MaybeUninitializedPlacesDomain;
@@ -495,7 +495,7 @@ impl<'tcx> Analysis<'tcx> for MaybeUninitializedPlaces<'_, 'tcx> {
 
     fn bottom_value(&self, _: &mir::Body<'tcx>) -> Self::Domain {
         // bottom = initialized (`initialize_start_block` overwrites this on first entry)
-        MixedBitSet::new_empty(self.move_data().move_paths.len())
+        Self::Domain::new_empty(self.move_data().move_paths.len())
     }
 
     // sets state bits for Arg places