Add test for GH-16355 (fixed by previous commit)

ext/opcache/tests/jit/gh16355.phpt

@@ -0,0 +1,19 @@
+--TEST--
+GH-16355 (Assertion failure in ext/opcache/jit/ir/ir_ra.c:1139)
+--EXTENSIONS--
+opcache
+--INI--
+opcache.jit=1203
+opcache.jit_buffer_size=64M
+--FILE--
+<?php
+function test($in, $cond) {
+    if ($cond) {
+        eval('');
+    }
+    while (stream_bucket_make_writeable($in)) {}
+}
+?>
+DONE
+--EXPECT--
+DONE