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/bigint5.js

@@ -0,0 +1,57 @@
+/* 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 check_syntax_error(code)
+{
+  try {
+    eval(code)
+    assert(false)
+  } catch (e) {
+    assert(e instanceof SyntaxError)
+  }
+}
+
+check_syntax_error("1N")
+check_syntax_error("3.5n")
+check_syntax_error("3e10n")
+check_syntax_error("3e+10n")
+check_syntax_error("0xn")
+check_syntax_error("0on")
+check_syntax_error("0bn")
+check_syntax_error("0777n")
+check_syntax_error("00777n")
+check_syntax_error("0x1 n")
+
+assert(0n == 0n)
+assert(0n == -0n)
+assert(12n == 12n)
+assert(123456789012345678901234567890123456789012345678901234567890n == 123456789012345678901234567890123456789012345678901234567890n)
+assert(12n != -12n)
+assert(123456789012345678901234567890123456789012345678901234567890n != -123456789012345678901234567890123456789012345678901234567890n)
+
+assert(0xffn == 255n)
+assert(0o77777n == 0x7fffn)
+assert(255n.toString(16) == "ff")
+
+var o = { 12n : "data" }
+assert(o[12] === "data")
+
+var c = class C { static 19n () { return "BigInt" } }
+assert(c[19]() === "BigInt")
+
+function f(p, q) {
+  assert(p + q === 5000n)
+}
+f(-1000n, 6000n)