Spellchecking compiler comments

This PR cleans up the rest of the spelling mistakes in the compiler comments. This PR does not change any literal or code spelling issues.

compiler/rustc_mir_dataflow/src/elaborate_drops.rs

@@ -860,7 +860,7 @@ where
             // and this is ok because `open_drop` here can only be reached
             // within that own generator's resume function.
             // This should only happen for the self argument on the resume function.
-            // It effetively only contains upvars until the generator transformation runs.
+            // It effectively only contains upvars until the generator transformation runs.
             // See librustc_body/transform/generator.rs for more details.
             ty::Generator(_, substs, _) => {
                 let tys: Vec<_> = substs.as_generator().upvar_tys().collect();

compiler/rustc_mir_dataflow/src/impls/liveness.rs

@@ -40,7 +40,7 @@ use crate::{AnalysisDomain, Backward, CallReturnPlaces, GenKill, GenKillAnalysis
 ///
 /// This makes `MaybeLiveLocals` unsuitable for certain classes of optimization normally associated
 /// with a live variables analysis, notably dead-store elimination. It's a dirty hack, but it works
-/// okay for the generator state transform (currently the main consumuer of this analysis).
+/// okay for the generator state transform (currently the main consumer of this analysis).
 ///
 /// [`MaybeBorrowedLocals`]: super::MaybeBorrowedLocals
 /// [flow-test]: https://github.com/rust-lang/rust/blob/a08c47310c7d49cbdc5d7afb38408ba519967ecd/src/test/ui/mir-dataflow/liveness-ptr.rs

compiler/rustc_mir_dataflow/src/impls/mod.rs

@@ -428,7 +428,7 @@ impl<'tcx> AnalysisDomain<'tcx> for MaybeUninitializedPlaces<'_, 'tcx> {
 
     // sets on_entry bits for Arg places
     fn initialize_start_block(&self, _: &mir::Body<'tcx>, state: &mut Self::Domain) {
-        // set all bits to 1 (uninit) before gathering counterevidence
+        // set all bits to 1 (uninit) before gathering counter-evidence
         state.insert_all();
 
         drop_flag_effects_for_function_entry(self.tcx, self.body, self.mdpe, |path, s| {