Revert of Merged: Disallow tail calls from async functions and generators

src/parsing/parser-base.h

Index: src/parsing/parser-base.h
diff --git a/src/parsing/parser-base.h b/src/parsing/parser-base.h
index 59cc3dd4524c66d2f54e752e3b918e4e13ed008c..98b85d6e4d810fc1e0fc0152b876aa4d4e616540 100644
--- a/src/parsing/parser-base.h
+++ b/src/parsing/parser-base.h
@@ -2604,12 +2604,6 @@
     ReportMessageAt(loc, MessageTemplate::kUnexpectedSloppyTailCall);
     *ok = false;
     return Traits::EmptyExpression();
-  }
-  if (is_resumable()) {
-    Scanner::Location sub_loc(sub_expression_pos, loc.end_pos);
-    impl()->ReportMessageAt(sub_loc, MessageTemplate::kUnexpectedTailCall);
-    *ok = false;
-    return impl()->EmptyExpression();
   }
   ReturnExprContext return_expr_context =
       function_state_->return_expr_context();