Fixed bug #64354 (Unserialize array of objects whose class can't be autoloaded fail)

about the __sleep one, since php_serialize_* are all void function,
so,,only check exception at the very begining
Fixed confused exception message while user threw exception
Merge branch 'PHP-5.4' into PHP-5.5

Conflicts:
	ext/standard/var_unserializer.c
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