Fix assertion in 're_insert_simple_iterator' (#2209)

It is a followup fix after #2169. It also fixes a memory leak.
This fixes #2198 and fixes #2204

JerryScript-DCO-1.0-Signed-off-by: László Langó llango.u-szeged@partner.samsung.com

tests/jerry/regression-test-issue-2198.js

@@ -0,0 +1,17 @@
+// 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 id_0 = Object.prototype.toString ; 
+Object.prototype.toString = function ( ) { return "SHIFTED" } ; 
+RegExp ( '#1: __str = new String({}); typeof __str === "object". Actual: typeof __str ===');

tests/jerry/regression-test-issue-2204.js

@@ -0,0 +1,34 @@
+// 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.
+
+try {
+  new RegExp("\{{91406,456}");
+  assert(false);
+} catch(e) {
+  assert(e instanceof SyntaxError)
+}
+
+try {
+  new RegExp("\{91406,456}");
+  assert(false);
+} catch(e) {
+  assert(e instanceof SyntaxError)
+}
+
+try {
+  new RegExp("\({91406,456}");
+  assert(false);
+} catch(e) {
+  assert(e instanceof SyntaxError)
+}