Tracing JIT: Fixed reference counting when escape because of IS_UNDEF element (test)

Author: dstogov

ext/opcache/tests/jit/fetch_dim_r_009.phpt

@@ -0,0 +1,22 @@
+--TEST--
+JIT FETCH_DIM_R: 009
+--INI--
+opcache.enable=1
+opcache.enable_cli=1
+opcache.file_update_protection=0
+opcache.jit_buffer_size=1M
+--FILE--
+<?php
+$ary = [[0]];
+for ($i = 2; $i < 5; $i++) {
+    var_dump($ary[0][$i>>1]);
+    $ary[0][$i] = 1;
+}
+?>
+--EXPECTF--
+Warning: Undefined array key 1 in %sfetch_dim_r_009.php on line 4
+NULL
+
+Warning: Undefined array key 1 in %sfetch_dim_r_009.php on line 4
+NULL
+int(1)