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/json-stringify.js

@@ -219,3 +219,54 @@ assert (JSON.stringify ({"key1": false, "key2": 12}, ["key1"], "abc") === '{\nab
 assert (JSON.stringify ({"key1": false, "key2": 12}, ["key2"], "abc") === '{\nabc"key2": 12\n}');
 assert (JSON.stringify ({"key1": false, "key2": 12}, ["key1", "key2"], "abc") === '{\nabc"key1": false,\nabc"key2": 12\n}');
 assert (JSON.stringify ({"key1": false, "key2": 12}, ["key", "key3"], "abc") === '{}');
+
+// Test with proxy
+assert(JSON.stringify(new Proxy(['foo'], {})) === '["foo"]');
+assert(JSON.stringify(new Proxy({0:"foo"}, {})) === '{"0":"foo"}');
+
+var target = [1,2,3];
+var handler = {
+  get(target, prop) {
+    if (prop == "length")
+    {
+      throw 42;
+    }
+  }
+}
+
+try {
+  JSON.stringify(new Proxy(target,handler));
+  assert(false);
+} catch (e) {
+  assert(e === 42);
+}
+
+var revocable = Proxy.revocable (target, { get (t, p , r) {
+  if (p == "toJSON") {
+    revocable.revoke();
+  }
+}});
+var proxy = revocable.proxy;
+
+try {
+  JSON.stringify(proxy);
+  assert(false);
+} catch (e) {
+  assert(e instanceof TypeError);
+}
+
+// Checking quoting strings
+assert(JSON.stringify("ab𬄕c") === '"ab𬄕\\u001fc"');
+assert(JSON.stringify("ab\uDC01cd") === '"ab\\udc01c\\u001fd"');
+assert(JSON.stringify("ab\uDC01cd\uD8331e") === '"ab\\udc01c\\u001fd\\ud8331e"');
+
+// Test case where the proxy is already revoked
+var handle = Proxy.revocable([], {});
+handle.revoke();
+
+try {
+  JSON.stringify(handle.proxy);
+  assert(false);
+} catch (ex) {
+  assert(ex instanceof TypeError);
+}