Fix post increase / decrease in the pre-scanner. (#3430)

Fixes #3397.

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

tests/jerry/arithmetic-parse.js

@@ -41,3 +41,6 @@ parse ("a =% b");
 
 parse ("c = a+");
 parse ("c = a-");
+
+parse("a++\n()")
+parse("a--\n.b")

tests/jerry/regression-test-issue-3397.js

@@ -0,0 +1,18 @@
+// 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.
+
+var $
+
+$++
+[ ]