fix: correct typos and improve comments in compiler code

compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs

@@ -648,9 +648,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 .expect("Failed to unify coroutine interior type");
             let mut obligations = ok.obligations;
 
-            // Also collect the obligations that were unstalled by this unification.
+            // Also collect the obligations that were uninstalled by this unification.
             obligations
-                .extend(self.fulfillment_cx.borrow_mut().drain_unstalled_obligations(&self.infcx));
+                .extend(self.fulfillment_cx.borrow_mut().drain_uninstalled_obligations(&self.infcx));
 
             let obligations = obligations.into_iter().map(|o| (o.predicate, o.cause));
             self.typeck_results.borrow_mut().coroutine_stalled_predicates.extend(obligations);

compiler/rustc_mir_transform/src/early_otherwise_branch.rs

@@ -288,7 +288,7 @@ fn evaluate_candidate<'tcx>(
         return None;
     }
 
-    // When thie BB has exactly one statement, this statement should be discriminant.
+    // When this BB has exactly one statement, this statement should be discriminant.
     let need_hoist_discriminant = bbs[child].statements.len() == 1;
     let child_place = if need_hoist_discriminant {
         if !bbs[targets.otherwise()].is_empty_unreachable() {

compiler/rustc_mir_transform/src/gvn.rs

@@ -27,7 +27,7 @@
 //! _b = some other value // also has VnIndex i
 //! ```
 //!
-//! We consider it to be replacable by:
+//! We consider it to be replaceable by:
 //! ```ignore (MIR)
 //! _a = some value // has VnIndex i
 //! // some MIR

src/tools/miri/tests/pass/tls/tls_leak_main_thread_allowed.rs

@@ -13,7 +13,7 @@ pub fn main() {
     TLS.set(Some(Box::leak(Box::new(123))));
 
     // We can only ignore leaks on targets that use `#[thread_local]` statics to implement
-    // `thread_local!`. Ignore the test on targest that don't.
+    // `thread_local!`. Ignore the test on targets that don't.
     if cfg!(target_thread_local) {
         thread_local! {
             static TLS_KEY: Cell<Option<&'static i32>> = Cell::new(None);