Don't throw `PhutilMissingSymbolException` from within `method_exists` and `property_exists` calls
Don't throw `PhutilMissingSymbolException` from within `method_exists` and `property_exists` calls

Summary: Ref T1116. Fixes T9954. It seems that `method_exists` and `propery_exists` can trigger PHP autoloaders as well.

Test Plan: Fixed the issue described in T9954.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin

Maniphest Tasks: T1116, T9954

Differential Revision: https://secure.phabricator.com/D14860

Symplicity/libphutil,Symplicity/libphutil,Symplicity/libphutil