Spellchecking compiler code

Address some spelling mistakes in strings, private function names, and function params.

compiler/rustc_codegen_llvm/src/debuginfo/metadata/enums/cpp_like.rs

@@ -356,7 +356,7 @@ fn build_union_fields_for_direct_tag_generator<'ll, 'tcx>(
     generator_type_di_node: &'ll DIType,
 ) -> SmallVec<&'ll DIType> {
     let Variants::Multiple { tag_encoding: TagEncoding::Direct, tag_field, .. } = generator_type_and_layout.variants else {
-        bug!("This function only supports layouts with direcly encoded tags.")
+        bug!("This function only supports layouts with directly encoded tags.")
     };
 
     let (generator_def_id, generator_substs) = match generator_type_and_layout.ty.kind() {