Fix Reflect.getPrototypeOf for primitive arguments (#3354)

Fixes #3349.

JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai dbatyai@inf.u-szeged.hu

tests/jerry/es2015/reflect-getPrototypeOf.js

@@ -15,3 +15,17 @@
 assert (Reflect['getPrototypeOf']({}) === Object.prototype);
 assert (Reflect['getPrototypeOf'](Object.create(null)) === null);
 assert (Reflect['getPrototypeOf'](Object.prototype) === null);
+
+try {
+  Reflect.getPrototypeOf();
+  assert (false);
+} catch (e) {
+  assert (e instanceof TypeError);
+}
+
+try {
+  Reflect.getPrototypeOf("str");
+  assert (false);
+} catch (e) {
+  assert (e instanceof TypeError);
+}