Fix literal free when show opcodes is enabled. (#2398)

A literal might be not freed if it is stored in a register,
and PARSER_DUMP_BYTE_CODE is enabled, but opcodes are not shown.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

tests/jerry/regression-test-issue-2398.js

@@ -0,0 +1,21 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This issue was triggered when show opcodes was enabled at compile
+// time but not enabled in runtime. A memory leak was created.
+
+function f()
+{
+  var \u0042 = true;
+};