To not enter isolate when calling V8\Isolate::IsDead()

Author: pinepain

Diff for: src/php_v8_isolate.cc

@@ -493,7 +493,7 @@ static PHP_METHOD(V8Isolate, IsDead) {
     }
 
     PHP_V8_ISOLATE_FETCH_WITH_CHECK(getThis(), php_v8_isolate);
-    PHP_V8_ENTER_ISOLATE(php_v8_isolate); // TODO: can we just fetch isolate object here and do not eneter it?
+    PHP_V8_DECLARE_ISOLATE(php_v8_isolate);
 
     RETURN_BOOL(isolate->IsDead());
 }

Diff for: tests/V8Isolate_IsDead.phpt

@@ -0,0 +1,21 @@
+--TEST--
+V8\Isolate::IsDead()
+--SKIPIF--
+<?php if (!extension_loaded("v8")) print "skip"; ?>
+--FILE--
+<?php
+
+/** @var \Phpv8Testsuite $helper */
+$helper = require '.testsuite.php';
+
+require '.v8-helpers.php';
+$v8_helper = new PhpV8Helpers($helper);
+
+
+$isolate = new V8\Isolate();
+$helper->method_export($isolate, 'IsDead');
+
+
+?>
+--EXPECT--
+V8\Isolate->IsDead(): bool(false)