* lang_php/analyze/foundation/controlflow_php.ml: simplify
* lang_php/analyze/foundation/dataflow_php.ml: CEs
* lang_php/analyze/foundation/controlflow_build_php.ml: simplify
* tests/php/controlflow/for_continue.php: undo jiao's stuff temporarily,
to fix regression
* lang_php/analyze/foundation/controlflow_build_php.ml: comment