pick up int64 export test from issue phpv8#287

tests/long_int64.phpt

@@ -0,0 +1,32 @@
+--TEST--
+Test V8::executeString() : Check long 64-bit export from PHP to JS
+--SKIPIF--
+<?php require_once(dirname(__FILE__) . '/skipif.inc'); ?>
+--FILE--
+<?php
+
+$addInt = function ($a, $b) {
+    return $a + $b;
+};
+
+$v8 = new V8Js('PHP');
+$v8->add = $addInt;
+$v8->p1 = 10;
+$v8->p2 = pow(2,45);
+
+var_dump($v8->p2);
+
+var_dump($v8->executeString('
+	var res = PHP.p1 + PHP.p2;
+	"p1:" + PHP.p1 +
+	", p2:" + PHP.p2 +
+	", PHP.add(p1,p2)=" + PHP.add(PHP.p1, PHP.p2) +
+	", p1+p2=" + res +
+	" -> " + (new Date(res)).toISOString();
+	'));
+?>
+===EOF===
+--EXPECT--
+int(35184372088832)
+string(105) "p1:10, p2:35184372088832, PHP.add(p1,p2)=35184372088842, p1+p2=35184372088842 -> 3084-12-12T12:41:28.842Z"
+===EOF===