Fix object initializer prescanning issues. (#2563)

This patch fixes incorrect syntax errors reported by the prescanner for
ES5.1 getter/setter property initializers and ES2015 computed properties.

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

tests/jerry/es2015/object-computed-prescanner.js

@@ -0,0 +1,52 @@
+// 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.
+
+function member_str() {
+  return "member";
+}
+
+switch (true) {
+default:
+  var obj = {
+    ["val" + "ue"]: 0,
+    set[member_str()](x) {
+      // Multiple statements.
+      this.value = x + 4;
+      this.value += 2;
+    },
+    get[member_str() ? member_str() : ""]() {
+      // Multiple statements.
+      this.value = this.value + 1;
+      return this.value;
+    },
+    get
+      [1 + 2]
+      ()
+    {
+      return 3;
+    },
+    [false ? member_str()
+           : ""]
+     :8
+  }
+}
+
+obj["member"] = 10;
+assert(obj.member === 17);
+assert(obj.member === 18);
+
+assert(obj[3] === 3);
+assert(obj["3"] === 3);
+
+assert(obj[""] === 8);

tests/jerry/object-literal-prescanner.js

@@ -0,0 +1,43 @@
+// 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.
+
+switch (true) {
+default:
+  var obj = {
+    value: 0,
+    set
+      member
+      (x)
+    {
+      // Multiple statements.
+      this.value = x + 4;
+      this.value += 2;
+    },
+    get"member"() {
+      // Multiple statements.
+      this.value = this.value + 1;
+      return this.value;
+    },
+    get 3() {
+      return 3;
+    }
+  }
+}
+
+obj["member"] = 10;
+assert(obj.member === 17);
+assert(obj.member === 18);
+
+assert(obj[3] === 3);
+assert(obj["3"] === 3);