Bugfixes (SimpleXML, PDO prepared statements, HPHPi behavior)

Hi, i try to run a php open source software, first with HPHPi. To keep it running, i made these changes in the hiphop core.

Commit 20503dc3ce466741dc4706012d4bd00c58a04407 is not needed to pull or merge but i'm a git newbie and i don't know how to remove the commit from the request.