Description:
------------
Nesting a try/finally inside a try/catch in a loop within a Generator will cause too many live vars to be cleaned up (i.e. outside its live range).

Test script:
---------------
function gen() {
        $array = ["foo"];
        $array[] = "bar";

        foreach ($array as $item) {
                try {
                        try {
                                yield;
                        } finally {
                                echo "fin $item\n";
                        }
                } catch (\Exception $e) {
                        echo "catch\n";
                        continue;
                }
        }
}
$g = gen();
$g->throw(new Exception);

Expected result:
----------------
fin foo
catch
fin bar


Actual result:
--------------
fin foo
catch
fin bar
<segmentation fault>