Remove ES_NEXT macro (#4915)

- remove all '#JERRY_ESNEXT' macro
- remove 5.1 build profile, update test runner accordingly (Note: all builtins are turn on by default)
- move tests from tests/jerry/esnext into tests/jerry, concatenate files with same names
- add skiplist to some snapshot tests that were supported only in 5.1
- fix doxygen issues that were hidden before (bc. of es.next macro)

Co-authored-by: Martin Negyokru negyokru@inf.u-szeged.hu
JerryScript-DCO-1.0-Signed-off-by: Adam Szilagyi aszilagy@inf.u-szeged.hu

tests/jerry/generator-yield.js

@@ -0,0 +1,86 @@
+/* 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.
+ */
+
+/* This file checks yield syntax errors. */
+
+function check_syntax_error(str)
+{
+  try {
+    eval(str);
+    assert(false);
+  } catch (e) {
+    assert(e instanceof SyntaxError);
+  }
+}
+
+function  *  gen()
+{
+  yield , yield
+
+  yield
+     , yield
+
+  (yield
+  )
+
+  yield[
+  1]
+}
+
+function*gen2()
+{
+  1 ?
+    yield
+  :
+    yield
+}
+
+var gen3 = function*(){
+  (yield)/[yield]
+}
+
+check_syntax_error("function *gen(){ yield % yield }");
+check_syntax_error("function *gen(){ (yield) % yield }");
+check_syntax_error("function *gen(){ yield % (yield) }");
+check_syntax_error("function *gen(){ (yield\n1) }");
+check_syntax_error("function *gen(){ function yield() {} }");
+check_syntax_error("function *gen(){ (yield)=>1 }");
+check_syntax_error("function *gen(){ yield => 1 }");
+check_syntax_error("function *gen(){ yi\\u0065ld 1 }");
+
+function *gen4() {
+  var f = function yield(i) {
+    if (i = 0)
+      return yield(i + 1)
+
+    return 39
+  }
+
+  return f(0)
+}
+
+assert(gen4().next().value === 39);
+
+(function *() {
+  () => yield
+  yield 1;
+})
+
+function *gen5() {
+  var o = {
+    ["f"]() { yield % yield }
+  }
+  yield 1;
+}