fix class ErrorHandler for HHVM (v 3.4.3)

It is a partial solution to the bug 69014

* add private static function ErrorHandler::onPhpError();
* add private static function ErrorHandler::onHhvmError();
* add const PhpTagsException::WARNING_TOO_MANY_ARGUMENTS;
* add const PhpTagsException::FATAL_UNEXPECTED_OBJECT_TYPE;

Change-Id: Ib423619a8116f36a15ee747ca2074cd827e650f6