Description:
------------
If JIT is enabled, trying to add an element to the array returned
by func_get_args() triggers an assertion vialotion[1], because the
array's refcount is 2.

[1] <https://github.com/php/php-src/blob/master/Zend/zend_hash.c#L965>


Test script:
---------------
<?php
function foo() {
    $args = func_get_args();
    $args[] = "bar";
}
foo();
?>


Actual result:
--------------
Assertion failed: (zend_gc_refcount(&(ht)->gc) == 1) || ((ht)->u.flags & (1<<6)), file Zend\zend_hash.c, line 965