Implement Regexp.prototype[@@match] method (#3345)

The algorithm is based on ECMA-262 v6, 21.2.5.6

The following helper methods are also implemented:
  - RegExpExec: ECMA-262 v6, 21.2.5.2.1
  - AdvanceStringIndex: ECMA-262 v6, 21.2.5.2.3

JerryScript-DCO-1.0-Signed-off-by: Adam Szilagyi aszilagy@inf.u-szeged.hu

tests/jerry/es2015/regexp-prototype-match.js

@@ -0,0 +1,74 @@
+// 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 regexp = /[0-9]+/g;
+var str = '2016-01-02';
+var num = 12131233;
+
+// Test with string input
+var result = regexp[Symbol.match](str);
+assert(result.toString() === "2016,01,02");
+
+regexp = /[0-5]+/g;
+result = regexp[Symbol.match](str);
+assert(result.toString() === "201,01,02");
+
+regexp = /[0-1]+/g;
+result = regexp[Symbol.match](str);
+assert(result.toString() === "01,01,0");
+
+regexp = /([0-9]+)-([0-9]+)-([0-9]+)/g
+result = regexp[Symbol.match](str);
+assert(result.toString() === "2016-01-02");
+
+// Test with number input
+regexp = /[0-9]+/g;
+result = regexp[Symbol.match](num);
+assert(result.toString() === "12131233");
+
+// Test with empty string
+result = regexp[Symbol.match]('');
+assert(result === null);
+
+// Test with undefined
+result = regexp[Symbol.match](undefined);
+assert(result === null);
+
+// Test when input is not a regexp
+regexp = 12;
+
+try {
+  result = regexp[Symbol.match](str);
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+// Test with RegExp subclass where we override the [Symbol.match] function
+class RegExpSub extends RegExp {
+  [Symbol.match](str) {
+    var result = RegExp.prototype[Symbol.match].call(this, str);
+    if (result) {
+      return "VALID";
+    }
+    else
+    {
+      return "INVALID";
+    }
+  }
+}
+
+var regexp1 = new RegExpSub('([0-9]+)-([0-9]+)-([0-9]+)');
+result = regexp1[Symbol.match](str);
+assert(result === "VALID");