Implement function destructuring argument support. (#3322)

Furthermore create unmapped arguments objects if a function has a non-simple argument.
A few destructuring pattern issues were fixed as well.

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

tests/jerry/es2015/function-pattern1.js

@@ -0,0 +1,93 @@
+// 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 must_throw (str, type = SyntaxError)
+{
+  try
+  {
+    eval (str);
+    assert (false);
+  }
+  catch (e)
+  {
+    assert (e instanceof type)
+  }
+}
+
+must_throw ("function f(a, [a]) {}");
+must_throw ("function f([a], a) {}");
+must_throw ("function f(a = b, [b]) {}; f()", ReferenceError);
+must_throw ("function f([a+b]) {}");
+must_throw ("function f([a().b]) {}");
+
+function a1([a,b]) {
+  var a, b;
+
+  assert(a === 1);
+  assert(b === undefined);
+
+  var a = 3;
+  assert(a === 3);
+}
+a1([1]);
+
+function a2([a,b]) {
+  eval("var a, b");
+  assert(a === 1);
+  assert(b === undefined);
+
+  eval("var a = 3");
+  assert(a === 3);
+}
+a2([1]);
+
+function f1(a, [b], c, [d], e)
+{
+  assert (a === 1);
+  assert (b === 2);
+  assert (c === 3);
+  assert (d === 4);
+  assert (e === 5);
+}
+f1(1, [2], 3, [4], 5)
+
+function f2(a, [b], c, [d], e)
+{
+  eval("");
+  assert (a === 1);
+  assert (b === 2);
+  assert (c === 3);
+  assert (d === 4);
+  assert (e === 5);
+}
+f2(1, [2], 3, [4], 5)
+
+var g1 = (a, [b], c, [d], e) => {
+  assert (a === 1);
+  assert (b === 2);
+  assert (c === 3);
+  assert (d === 4);
+  assert (e === 5);
+}
+g1(1, [2], 3, [4], 5)
+
+var g2 = (a, [b], c, [d], e) => {
+  eval("");
+  assert (a === 1);
+  assert (b === 2);
+  assert (c === 3);
+  assert (d === 4);
+  assert (e === 5);
+}
+g2(1, [2], 3, [4], 5)