Remove commented out code.

Author: bricknerb

toolchain/sem_ir/type_iterator.cpp

@@ -148,13 +148,6 @@ auto TypeIterator::ProcessTypeId(TypeId type_id) -> std::optional<Step> {
       return Step::PartialStart();
     }
     case CARBON_KIND(PointerType pointer_type): {
-      // InstId pointee_inst_id = pointer_type.pointee_id;
-      // TypeId pointee_type_id =
-      //     sem_ir_->types().GetTypeIdForTypeInstId(pointee_inst_id);
-      // if (sem_ir_->types().Is<CustomCppVoidType>(pointee_type_id)) {
-      //   return Step::ConcreteType{.type_id =
-      //   CustomCppVoidPointerType::TypeId};
-      // }
       Push(EndType());
       PushInstId(pointer_type.pointee_id);
       return Step::PointerStart();